This week鈥檚 new questions
Just how much stuff is there? Can we estimate the quantity of matter in the observable universe? Terry Day, by email
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Humans
Psychedelic skies over Chile reveal the full extent of light pollution
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Twisteddoodles on bacteria that like to prank researchers
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Tom Gauld’s diagram of the scientific method
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Environment
The epic journeys of green sea turtles revealed by 50 years of data
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How to solve one of the world鈥檚 hardest maths problems for under $25
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How do city trees get enough water?
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Where鈥檚 the best place to be buried to preserve your body as a fossil?
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This week鈥檚 new questions
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Twisteddoodles on getting used to the new normal
This week's cartoon from Twisteddoodles
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Tom Gauld on when you need 7 tonnes of bananas for an experiment
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Technology
Mega solar plant uses 170,000 mirrors to generate heat for electricity
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Cats are famously grumpy, but do they have facial expressions?
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How long can viruses survive outside the body?
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