What鈥檚 better for the environment, using a hand dryer or paper towels?
Does a hand dryer produce more carbon emissions than using two paper towels to dry your hands? Readers respond
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What happens to the energy of a moving car when it hits a wall?
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This week’s questions
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Why do cars have speed limits 鈥� is it physics or just practicality?
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Why is toast so different from bread heated in a microwave?
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This week鈥檚 new questions
Core subject: how does Earth’s magnetic field arise?
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Why does the jet stream affect our weather?
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This week’s new questions
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Has all the hardware sent into space affected Earth鈥檚 gravity?
We鈥檝e launched a lot of spacecraft, reducing the mass of the planet. Does that affect the planet鈥檚 gravity? Our readers have the answer
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Kissed by a human or licked by an animal: which has more disease risk?
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Does your fringe grow faster than the hair on the rest of your head?
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This week’s new questions
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This week’s new questions
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