Shadowing Practice: Your Skeleton Is Electric - Learn English Speaking with Video
Creating lesson...
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Your bones produce real electricity.
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Collagen molecules, your bones' protein building blocks, contain charged groups of atoms.
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As you walk, your bones compress and the molecules slip past each other, creating an imbalance of charges like a tiny battery.
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Scientists call this piezoelectricity.
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Luckily, this charge can't shock you.
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To light an LED for one second, you'd need to walk for 19 years.
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But these tiny jolts are part of a vital process your skeleton is constantly being rebuilt, directing this process of 42 billion osteocyte cells.
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Every step drives fluid through tiny tunnels around these cells, generating another faint electrical signal.
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Normally, osteocytes tell bone -building cells to keep away so your bones don't become huge everywhere.
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But when your bones are stressed, your cells get the signal to call the builders in, adding new soft bone where it's needed.
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Some scientists think collagen's piezoelectric charge is what attracts the minerals that harden the bone.
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The precise mechanisms are still debated, but it's why exercise is good for more than just building muscle.
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So even in your 60s, weightlifting can stop your bones from thinning and bulk up your spine.
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Vocabulary and speaking notes for this lesson
This speaking lesson is built on the video “Your Skeleton Is Electric”. The speaker keeps coming back to these words: bone, cells, tiny, charge. This video has 13 sentences and 189 words to shadow. The speech runs for 1:11. The speaker talks at a natural 159 words per minute, close to everyday conversation. Only 72% of the words are among the 3,000 most common in English, so the vocabulary is demanding.
Key vocabulary in this video
15 words from the video worth learning, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| bone noun | /boʊn/ | A composite material consisting largely of calcium phosphate and collagen and making up the skeleton of most vertebrates. |
| scientist noun | /ˈsaɪəntəst/ | One whose activities make use of the scientific method to answer questions regarding the measurable universe. A scientist may be involved in original research… |
| molecule noun | /ˈmɑ.lɪ.kjul/ | The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by… |
| thin adjective | /ˈθɪn/ | Having little thickness or extent from one surface to its opposite. |
| shock noun | /ʃɔk/ | A sudden, heavy impact. |
| muscle noun | /ˈmʌs.əl/ | A contractile form of tissue which animals use to effect movement. |
| electricity noun | /ɪˌlɛkˈtɹɪsɪti/ | Originally, a property of amber and certain other nonconducting substances to attract lightweight material when rubbed, or the cause of this property; now… |
| electrical adjective | /ɪˈlɛktɹɪkəl/ | Related to electricity (or electronics) |
| vital adjective | /ˈvaɪtəl/ | Relating to or characteristic of life. |
| slip verb | /ˈslɪp/ | To lose one’s traction on a slippery surface; to slide due to a lack of friction. |
| mechanism noun | /ˈmɛk.ə.nɪ.zəm/ | Any mechanical means for the conversion or control of motion, or the transmission or control of power. |
| tunnel noun | /ˈtʌn(ə)l/ | An underground or underwater passage. |
| fluid noun | /ˈflu.ɪd/ | Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma. |
| generate verb | /ˈd͡ʒɛn.ə.ɹeɪt/ | To bring into being; give rise to. |
| attract verb | /əˈtɹækt/ | To pull toward without touching. |
Phrasal verbs you will hear
| Word | Meaning |
|---|---|
| keep away verb | To refrain from coming (near). |
Grammar in this video
The structures the speaker uses most, with the exact words from the video:
| Structure | In the video |
|---|---|
| Passive voice be + past participle — the focus is on what happens, not who does it | are stressed · are still debated |
Pronunciation to watch
The speaker uses 3 contractions and reduced forms, such as can't, don't, you'd. Say them the short way, as you hear them.
- Long words — get the stress right: electricity /ɪˌlɛkˈtɹɪsɪti/, electrical /ɪˈlɛktɹɪkəl/, mechanism /ˈmɛk.ə.nɪ.zəm/, piezoelectricity /pʌɪˌiːzəʊ.ɪlɛkˈtrɪsɪti/
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Start at 0.75× speed, shadow it sentence by sentence, then go back to normal speed once it feels easy.
- Record yourself and compare with the original, paying attention to words like bone, scientist, molecule.
What is the Shadowing Technique?
Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.