This week’s new questions
1 February 2023
What is the most efficient way to stir to dissolve something in water? And is it possible to distinguish sunrise from sunset from a snapshot?
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Premium
How to identify moon craters and mountains on the lunar surface
1 February 2023
The moon’s brightness might frustrate some stargazers, but a closer look will reveal some amazing features, says Abigail Beall
Why are birds mostly monogamous, but not mammals?
8 February 2023
Birds are mostly monogamous because it is the only way that males can be sure of having any surviving offspring.
What is the most efficient way to load passengers into an aircraft?
8 February 2023
All sorts of methods have been devised to speed up aircraft boarding, but semi-random chaos still might be the fastest way say our readers - who also suggest some unconventional alternatives.
What is the point in having nerve endings in our teeth?
22 February 2023
The benefits of having nerves in our teeth far outweigh the painful downsides, say our readers
Why do loose screws only get looser, not the other way round? (part 2)
22 February 2023
Our readers provide yet more evidence that screws don’t always get looser
This week’s new questions
15 February 2023
How was rhubarb discovered to be edible when it isn’t palatable raw? Why do flames go out when blown?
How much of my body from 40 years ago is part of me today? (part 2)
15 February 2023
While much of your body gets recycled, one reader points out why this isn't true for the brain
Puzzle #209: Can you work out how many houses there are on Long Road?
15 February 2023
Can you solve this week’s arithmetical puzzle, Postman’s knock? Plus the answer to puzzle #208
Why is this snail carrying an extra shell on its back?
11 January 2023
One reader found a snail in their garden carrying a second shell on top of its original, and another reader speculates about how this occurred