Still waters
When a container of liquid is rotated on its base in an upright position, the liquid inside doesn't turn with it and remains static. Why is this?
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Battery power
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This week鈥檚 new questions
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Why does a lightning strike sizzle and power light bulbs?
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This week鈥檚 new questions
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Why do biscuits go soft and cakes go hard?
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Does a large meal make you tired, and if so, why?
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This week鈥檚 new questions
How long before all human traces are wiped out?
What is the carbon payback period for a wind turbine?
How long does it take to pay back the energy and resources used to make a wind turbine, and are they worth building? Our readers have the answers
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How can a tree reabsorb its own branch?
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This week鈥檚 new questions
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How does water hydrate us?
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Why do dogs and horses roll on their backs when happy?
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