Why are tree leaves so many different shades of (mainly) green?
Some leaves are a dark green, others much lighter, while some are reddish. What gives rise to this range of colours?
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Can satellites have satellites that have satellites?
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Why do cabbages exist when their shape prevents photosynthesis?
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This week鈥檚 new questions
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Why you should trust reindeer to pick stocks over politicians
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Tom Gauld on the shrinking size of powerful computers
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Twisteddoodles on when cells exchange gifts
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Book of maps shows Antarctica in wonderful detail
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Humans
Why you should start thinking about planting potatoes now
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Why don鈥檛 high-flying birds freeze in the frigid temperatures?
Birds can fly at tens of thousands of metres high. Ice forms on the wings of planes at this altitude, so why don鈥檛 the birds freeze?
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Do we perceive colours around us differently to others?
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This week鈥檚 new questions
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Mathematicians finally discover when your elevator will arrive
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Space
Jupiter Saturn conjunction: How to see tonight’s ‘Christmas star’
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