Why do we have five digits on each hand, and not some other number?
The number of fingers and toes we have is thanks to our amphibian ancestors, but many animals have a different number, say our readers
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When does a theory become a fact and who decides?
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Can bullets fired in the air cause injury when they return? (part 2)
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This week鈥檚 new questions
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If mosquitoes were eradicated, what would be the consequences?
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Is it just a coincidence that there are two dippers in the night sky?
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Aside from our perception, how can we know that time exists?
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This week鈥檚 new questions
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When is the right time to panic?
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Does simmering versus boiling make a difference when cooking?
Water boils at 100掳C, so why does it matter whether it is gently simmering or energetically boiling? Our readers debate the impact
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Could we run out of musical note combinations? (continued)
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This week鈥檚 new questions
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Can bullets fired upwards cause injuries when they return to earth?
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How complex does an organism have to be to exhibit free will?
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