Dusty rain: Why does rain leave a residue behind and where does it come from?
Rain can leave a deposit on normally sparkling windows. Where does this dust come from? Readers explain the Saharan connection
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ACHOO: Why do some people sneeze so many times?
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This week鈥檚 new questions
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Twisteddoodles on why you probably think this diagram is about you
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Tom Gauld on how to create a truly bottomless cup of coffee
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Humans
Baking without eggs: How to use aquafaba to make meringues
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The worst April fools鈥� papers of 2020
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Level crossing: Why is it hard to walk if there’s a large drop nearby?
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Running while cycling: Why does my nose run when I’m on my bike?
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This week鈥檚 new questions
How do large trees in cities get enough water to survive? Send your thoughts and observations to Almost the Last Word, all contributions appreciated
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Health
My patient’s marriage was saved by a brain injury
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Earth
Dazzling damselflies and a SpaceX plume commended by photo awards
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Tom Gauld on making sure you get the right candidate
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Twisteddoodles on putting theory into practice
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