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Why are teeth so hard when they are made out of special kinds of tissue?  

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Why are teeth so hard when they are made out of special kinds of tissue?  

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How do we talk? Where does the voice come from?

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Is it true that if you are cold you get sicker more easily? And/or do you need to wear warm clothes after you sweat when it's cold outside? If so, why?

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How many bones is a baby born with and why and how do they fuse together as they grow older?

Thank you so much for answering our questions! 5S

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Why do we fart? Why do we have extra waste that doesn't exit the typical way? Why does it smell bad?

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Why is it necessary for the heart to be as large as one's fist?  How does the heart grow?

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The reflex of closing one's eyes doesn't seem helpful in a fight or flight response. Why do we close our eyes when we are scared...it would seem that one needs to keep their eyes open to run....

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How fast does blood travel?

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https://www.youtube.com/watch?v=P2pLJfWUjc8

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Your brain is made up of what chemicals?

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How does your brain send signals to the rest of your body?

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How do feelings affect the human body positively and negatively?

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Why do we need food?  Why can't we just take pills that have all the energy and nutrients that we need?

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Why is it that when you touch your uvula you feel ill? Or when you have a hair in your thought it makes you feel sick?

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Why do we hiccup?

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Hi guys - your question about sneezing was asked by another class, so I've shared their video with you.

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What is the purpose of the uvula?