I am 57 years old. Do I have any original parts? In other words, how much of the baby that was born in 1954 is still part of me? Also, how much of the 18-year-old teenager that I once was is still with me? Do my soft tissues cycle out over time? What about bones, nerves and brain matter?
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We're told to save electricity by switching off devices on standby. If a home is heated solely by electricity, would there still be any savings by turning off all those devices?
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If there are no pain receptors in the brain, how can a headache hurt so much?
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Why would the temperature go up in stages when cooking caramel? Should it just go from room temperature smoothly up to it's final cooking temp?
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Do sunglasses fool your body into not releasing enough melanin to protect you from the Sun's harmful rays? Does this mean wearing sunglasses makes you more likely to become sunburned?
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When I lay down, my feet appear farther away from me compared to when I am standing up. I wear contacts during the day and glasses during the evening. Could this be a product of my corrective eyewear or a manifestation of my brain due to different visual reference points?
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To assure procreation, nature offers as a "bribe" a certain amount of physical pleasure. This is easy to understand for those species who actually make physical contact during copulation, but fish remain a total mystery: how does ejecting one's eggs or sperm into a stream or the ocean bring an ecstatic experience?
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Why couldn't I focus on a reflection when close to the mirror?
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Do umbilical cords get tangled and knotted?
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The pupil of an eye widens when it looks though dark-tinted glass and due to this the eye gets more sunlight than it does without sunglasses. So why do we wear sunglasses?
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Cats have whiskers, and use them to explore and understand the world around them - does a nice moustache or bushy beard do the same?
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Do astronauts need a full 1G to remain in tip top health? Could we gat away with less, and if so, what's the minimum gravity required to keep astronauts healthy?
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If it takes a very massive star collapsing to form a black hole, and Hawking's radiation eats it away, then why doesn't it blow up after enough matter is eaten away?
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Can human waste be a source of power? Should we be searching sewage for a source of sparks?
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I know that during pregnancy a foetus gets oxygen from its mother via the umbilical cord. I was wondering what effect this has on the mother. Does she inhale more, or simply use oxygen more efficiently? What happens to her oxygen saturation level?
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Why do the tastes of some foods complement each other so well? For example, cheese and wine? What is the chemical reaction that takes place to make it so palatable?
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Over the past 100 years, and much more so in the past 40 years, medical science has been able to save an increasing number of babies (and mothers) being born that would have not survived if they had been born at any other time in human history. Is this having an impact on the human gene pool?
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How does a calculator work? How can it make complex calculation within nano-seconds? Also, how does it display the result on the screen?
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What is it that gives a wet dog that distinctive smell?
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