How do lichens survive on baking hot roofs?
In summer lichens on roof tiles are dry as a crisp in the hot sun, so how do they cope with the extreme conditions? Readers respond
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Are birds that walk more advanced than those that hop? (continued)
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Why is the noise so loud when bottles drop into the recycling hopper?
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This week鈥檚 new questions
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What is the smallest animal with eyes and could it see a molecule?
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Where does the spin of celestial objects come from? The big bang?
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Plastic is inert, so why does it have a taste and smell?
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This week鈥檚 new questions
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How long is 鈥榥ow鈥�, the gap between the past and the future?
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Can you get triple or quadruple rainbows? (continued)
More thoughts on the existence of multiple rainbows, and the conditions that give rise to them 鈥� including a very rare example captured on camera
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If plants communicate via their roots, do they get lonely in pots?
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This week鈥檚 new questions
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Why are tree leaves so many different shades of (mainly) green?
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Can satellites have satellites that have satellites?
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