Come clean: What’s the difference between shampoo and shower gel?
Are shampoo and shower gel different, and if so, how? It turns out to be surprisingly hard to answer this question, but there are some distinctions
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This week’s new questions
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Humans
Here’s the secret to the ultimate thrill ride according to science
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Environment
People have built a glacier in the desert using a huge tower of ice
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Tom Gauld on the scientific research facilities of Middle-earth
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Twisteddoodles on Earth’s race around the sun
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Technology
Did a massive nuclear antenna make Michigan’s trees grow taller?
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Humans
How to cook perfect chips: Learn the science of crispiness
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Mars bars: Why it’s time to write a national anthem for the Red Planet
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Camera precaution: what can be done to stop migrant deaths in lorries?
Carbon dioxide detectors, alarms, what is the best way to protect migrants who find their way into refrigerated lorries? Our readers have a few ideas
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Kicking the habit: is there any point stopping smoking in later life?
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This week’s new questions
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Space
NASA astronaut Kathryn Sullivan on zero G dreams and fixing Hubble
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Life
Contaminated banknote images reveal how money gets caked in bacteria
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