シャドーイング練習: The Most Expensive MISTAKES Ever - 動画で英語スピーキングを学ぶ
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SNCF.
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You've probably made an expensive mistake before.
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Whatever you're picturing right now, it's nothing.
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These next 10 mistakes cost billions of dollars, destroyed entire companies, and in one case, poisoned a continent for decades.
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Almost none of them started as a dramatic failure.
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They started with something small nobody bothered to check.
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Take France.
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It ordered hundreds of new trains.
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Bigger, faster, better.
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One problem, nobody checked if they'd actually fit.
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SNCF, the French national rail operator, commissioned a massive fleet upgrade in the 2010s.
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The new trains were built slightly wider than the old ones.
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Sounds minor, it wasn't.
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Turns out, thousands of platforms across older regional stations were built to narrower dimensions, some dating back over a century.
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Nobody in the procurement chain thought to actually go measure them before finalizing a design that assumed every platform was the same.
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The mistake wasn't discovered in a meeting.
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It was discovered when the trains showed up and didn't fit.
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SNCF had to spend roughly 50 million euros shaving down platforms across the network station by station.
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Here's the part that stings.
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The people who designed the trains and the people who managed the stations worked for the exact same organization.
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They just never talked to each other.
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an entire fleet redesigned around a number nobody bothered to verify because everyone assumed someone else already had.
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Found out the same way you'd find your new couch doesn't fit through the front door.
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After delivery, not before.
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Mars.
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NASA lost a $328 million spacecraft over a unit conversion, the kind of mistake that gets marked wrong on a middle school worksheet.
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The Mars Climate Orbiter was supposed to study the Martian atmosphere and act as a communications relay.
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One engineering team, working on the ground-based navigation software, used imperial units, pound-force seconds.
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Another team, building the spacecraft's thruster software, used metric, newton seconds.
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Nobody caught the mismatch before launch.
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The navigation software took in the imperial data and processed it as if it were metric, without converting it.
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Every single trajectory correction, every thruster firing calculated over the nine-month journey to Mars was off by a factor of roughly 4.45.
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By the time the orbiter reached Mars, it approached at completely the wrong altitude.
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Instead of settling into a stable orbit, it either burned up in the atmosphere or shot straight back out into deep space.
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NASA still isn't entirely certain which one happened.
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Nine months of travel, hundreds of engineers, hundreds of millions of dollars,
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Gone, because two teams working on the same spacecraft never agreed on which measurement system to use.
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And nobody thought to double-check.
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The investigation afterward didn't blame some exotic technical failure.
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It blamed a missing verification step that should have taken one person about 10 minutes.
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NASA switched almost entirely to metric on future missions.
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A little late for this one.
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Knight Capital.
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Knight Capital lost $440 million in 45 minutes.
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That works out to roughly $163,000 a second.
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The trading firm was rolling out new software across a set of eight servers before markets opened.
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One engineer forgot to update one of those servers with the new code.
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That single server still had old, defunct testing code sitting dormant on it, left over from years earlier.
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When the markets opened, that dead code woke up.
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It started firing off millions of unintended trades automatically, buying high and selling low, again and again and again,
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at a speed no human trader could ever hope to catch or stop.
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By the time anyone at Knight Capital actually realized what was happening and manually pulled the plug, the damage was already done.
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The company had accidentally built a machine whose entire job, purely by accident, was losing money as fast as physically possible.
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And it did that job perfectly.
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The firm that had been trading successfully for decades was essentially insolvent by lunchtime.
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It was bought out within the year for a fraction of its former value.
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One forgotten deployment step.
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On one server. $440 million gone.
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Nobody hacked Knight Capital.
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No market crash caused it.
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Their own software running exactly as it was coded to run just happened to be years-old code nobody remembered existed.
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That's the part that should scare you.
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Iran-5.
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The European Space Agency destroyed its own rocket 37 seconds after launch with code that used to work perfectly fine.
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Arian 5's inertial guidance software was reused from its predecessor, Arian 4, specifically to save development time and money.
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That decision made sense on paper.
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The software had flown successfully for years without issue.
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Except Arian 5 was significantly faster and more powerful than Arian 4 ever was.
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Its horizontal velocity produced a number too large for the old software's data format to handle.
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The system tried to convert that number, overflowed, and crashed almost instantly.
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Both the primary and the backup guidance computers were running identical software, so they failed at the exact same moment, for the exact same reason.
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There was no meaningful redundancy, because the so-called backup had the same fatal bug baked in from the start.
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The rocket veered violently off its intended course and was destroyed by its own self-destruct system,
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taking roughly $370 million worth of hardware and years of development with it.
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The code itself wasn't broken.
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It just was never built for a rocket this powerful, and nobody bothered to retest that assumption.
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The exact line of code responsible wasn't even needed after liftoff.
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It was leftover functionality from an earlier flight phase that engineers forgot to disable.
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A rocket destroyed by software doing a job nobody asked it to do anymore.
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Denver Airport.
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Denver International Airport tried to build the most advanced automated baggage system on the planet.
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It delayed the entire airport's opening by 16 months and cost around $560 million.
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The plan was fully automated luggage handling from end to end,
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computer-controlled carts zipping suitcases across the airport at high speed with zero human involvement anywhere in the process.
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Ambitious?
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Also wildly premature for the technology that actually existed at the time.
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The system jammed constantly, sometimes for hours.
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Carts collided with each other on the tracks.
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Bags got physically shredded and mangled by the very machinery meant to sort them gently.
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During testing, the failure rate was so high the system was essentially unusable in practice.
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Airlines refused to trust their passengers' luggage to a machine that ate suitcases for breakfast.
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So the airport ended up building an old-fashioned, boring, manual backup system anyway.
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right on top of the money already spent chasing the futuristic version.
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The automated system limped along in a reduced role for years before finally getting scrapped completely in 2005.
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Denver paid nearly half a billion dollars to build a machine, then paid again to replace it with the exact thing it was originally supposed to make obsolete.
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United Airlines, the system's primary user, ended up spending more on manual workarounds than the automated system was ever projected to save them.
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The future of baggage handling turned out to be a guy with a cart.
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Deep Water Horizon wasn't one single mistake.
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It was a chain of ignored warnings that nobody on the rig wanted to be the one to stop.
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The drilling rig was operating in the Gulf of Mexico in April 2010.
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Pressure tests came back showing clear signs of a problem building in the well.
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Those results were reinterpreted as fine, essentially explained away.
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A cement job meant to seal the well was rushed to save time and money.
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Safety systems that should have caught the failure were bypassed or simply weren't working.
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Then gas surged violently up the well and onto the rig itself.
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It ignited within seconds.
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Eleven workers died in the explosion.
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The well then spewed crude oil into the Gulf of Mexico for 87 straight days before engineers finally managed to cap it.
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It became the largest marine oil spill in United States history.
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Marine life, entire coastlines, and fishing economies up and down the Gulf were devastated for years afterward, some of them still recovering today.
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BP's total costs from fines, cleanup operations, and legal settlements eventually topped $65 billion.
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Every single warning sign existed beforehand, documented on paper.
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Every single one got explained away by someone trying to stay on schedule and under budget.
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Investigators later found the rig was running weeks behind schedule and millions over budget before the explosion.
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That pressure didn't caused the failure directly, it caused every single person who noticed a problem to hesitate before saying so.
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Daimler-Chrysler.
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In 1998, Daimler-Benz and Chrysler announced a so-called merger of equals.
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It was never equal, and it was never really a merger at all.
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Daimler, the German engineering giant behind Mercedes-Benz,
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effectively acquired Chrysler outright while calling it a partnership just to soften the optics for American shareholders and employees.
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The cultural clash was immediate and brutal.
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German precision and formality met Detroit's faster, looser corporate style, and neither side made any real effort to adapt to the other.
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Executives clashed constantly over everything, from product decisions down to who got access to private jets.
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Chrysler's American leadership team left in waves, taking institutional knowledge with them.
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Innovation slowed to a crawl.
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Costs ballooned instead of shrinking, the exact opposite of what the merger had promised investors.
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The combined company hemorrhaged value for years straight.
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Daimler eventually admitted defeat publicly and sold Chrysler off in 2007.
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Not to a buyer with any long-term vision for the brand, but to a private equity firm mainly interested in stripping it for parts.
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Daimler had spent around $36 billion to acquire Chrysler in the first place.
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It sold the company less than a decade later for essentially nothing, and effectively paid the buyer to take the problem off its hands.
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Analysts still point to this deal as the textbook case of what happens
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when two companies confuse merging their logos with merging their cultures.
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Turns out spreadsheets can't measure whether two management teams actually like each other.
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Yahoo.
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In 2008, Microsoft offered to buy Yahoo outright for $44.6 billion.
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Yahoo said no. It wasn't enough money.
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Yahoo's leadership genuinely believed the company was worth significantly more than that and pushed back hard, hoping to negotiate an even higher offer.
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Microsoft, unwilling to get dragged into a prolonged bidding war over a company it viewed as declining, simply walked away from the negotiating table entirely.
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That moment turned out to be the absolute peak.
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Yahoo never received another offer anywhere close to that number again.
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Its core search and advertising business kept steadily losing ground to Google, quarter after quarter, year after year,
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with no real turnaround in sight.
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The company spent the next decade trying and repeatedly failing to reinvent itself,
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burning through multiple leadership changes and strategic pivots that never actually landed with users or investors.
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In 2017, Verizon bought what remained of Yahoo's core internet business for $4.5 billion,
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roughly a tenth of what Microsoft had originally offered nine years earlier.
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Yahoo didn't hold out for a better deal in the end.
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It held out for no deal at all.
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Somewhere in a parallel universe, Yahoo's board took the $44.6 billion and everyone involved retired comfortably.
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In this one, they gambled on being underpaid and lost.
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AOL Time Warner The AOL Time Warner merger is still taught in business schools as the worst corporate deal in history. $165 billion,
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and it happened right before the Internet's first bubble spectacularly popped.
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In 2000, AOL, an Internet company riding the peak of the dot-com wave, merged with Time Warner, a sprawling media empire with movie studios,
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magazines, and cable networks built over decades.
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AOL's massively inflated stock price let it effectively swallow a company several times its actual underlying size.
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Then the dot-com bubble burst almost immediately after the ink dried.
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AOL's dial-up internet business, the exact thing that had justified the entire merger, started collapsing hard as broadband slowly took over the market.
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The endless synergy executives kept promising never materialized in any real way.
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Entire divisions fought each other for resources, instead of cooperating like the deal assumed they would.
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In 2002 alone, the combined company posted a staggering write-down of $99 billion,
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the largest annual net loss any American company had ever reported up to that point in history.
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The merger
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that was supposed to define the entire future of media instead became the textbook example of what happens
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when raw stock market hype gets mistaken for actual long-term strategy.
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Time Warner shareholders, who held on through the entire ordeal,
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watched their combined stock lose roughly $200 billion in value over the following two years.
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The dot-com crash gets the headlines.
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This merger is why it hurt Time Warner more than almost anyone else.
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Chernobyl Chernobyl wasn't caused by one failure.
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It was a routine safety test that went badly wrong on a reactor that was arguably never safe to begin with.
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The Soviet RBMK reactor design had a known structural flaw.
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Under certain low power conditions, it could actually become more reactive instead of less.
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The opposite of how a reactor is supposed to behave when something goes wrong.
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On April 26, 1986, operators ran a test to check how the reactor would perform during a simulated power outage.
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To run it, they disabled several critical safety systems, pushing the reactor into precisely the unstable state its flaw punished hardest.
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Power surged uncontrollably within seconds.
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Two explosions tore the reactor core apart and blasted radioactive material into the atmosphere.
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Dozens died in the immediate aftermath.
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Long-term deaths are still debated, with estimates ranging into the thousands.
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The total cost, including the abandoned city of Pripyat and the exclusion zone that still exists, is estimated at well over $200 billion.
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A test meant to make the reactor safer ended up proving definitively that it never was.
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10 Mistakes Hundreds of billions of dollars.
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And almost every single one traces back to the same root cause.
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Somebody trusted an assumption they never bothered to check.
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Rarely one big explosion out of nowhere.
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Just a small detail, quietly ignored, until one day, it isn't small anymore.
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動画で英語学習の楽しみ方
この動画は「史上最も高額なミス」について語り、フランスの鉄道会社やNASA、金融会社の失敗談を紹介しています。リアルな出来事を通じて、小さなミスが大きな結果をもたらすことを説明しており、聞き手を引き込むストーリーテリングが特徴です。英語学習者にとっては、日常会話で使えるフレーズだけでなく、ビジネスや科学分野の単語も学べる良い教材です。
日常会話に使える5つのフレーズ
- "It sounds minor, it wasn't."（小さなことのように聞こえるが、実はそうではなかった）：意外な結果を説明する時に使えます。
- "Nobody thought to double-check."（誰も再確認することを考えなかった）：ミスの原因を話す際に便利です。
- "Gone, because..."（...のために、全て失われた）：簡潔に結果と原因をつなげる表現です。
- "That works out to roughly..."（それはおよそ...になる）：数字を説明する時に使います。
- "The mistake wasn't discovered in a meeting."（ミスは会議中に発見されなかった）：状況の説明に適しています。
shadowspeakのステップバイステップガイド
この動画はスピードが速く、専門用語もありますが、shadow speakの練習に最適です。まず、動画を1分ずつ聞き、内容を理解しましょう。次に、同じ速さで繰り返し発音し、イントネーションやリズムを真似ます。難しい単語は一度止めて発音を確認し、慣れてきたら2倍速で挑戦してみましょう。IELTSスピーキング対策にもなるこの練習は、継続することでスピーキング力が飛躍的に向上します。途中でつまずいても大丈夫！少しずつ進めれば必ず成果が出ます。
動画で英語学習を楽しみながら、英語スピーキング練習を続けましょう。小さなミスを恐れず、繰り返し練習することが上達の秘訣です。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。