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Last Word

Battle cruiser approaching light speed in an outer space wormhole, 3d digitally rendered illustration; Shutterstock ID 91289105; purchase_order: -; job: -; client: -; other: -

How long would it take to accelerate to 99 per cent light speed?

If you wanted to avoid major injury to the astronauts inside, this might be tricky 鈥� but it wouldn't take long, if you had the right technology, say our readers

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an australopithecus, one of our ancestors; Shutterstock ID 790742188; purchase_order: -; job: -; client: -; other: -

Is it known when humans or our ancestors first started to sing?

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Lola the Cat, behind a window, London

This week鈥檚 new questions

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P2H56B Weasel standing upright, Mustela nivalis, Germany

Why do many animals have white undersides?

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PE5P96 Close up of two purple socks with yellow lemon detail, pegged to a washing line with two yellow clothes pegs, shot from below against a clear blue sky

Why do plastic clothes pegs fade and get brittle in the sun?

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Outdoor Backpack with Water Bottle on the back of a girl, School, isolated Green background Nature. Education concept; Shutterstock ID 2038295597; purchase_order: -; job: -; client: -; other: -

Is it more efficient to cart water in a bottle or my stomach? Part 2

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Archaeological excavations. Human remains (bones, skeleton and skull) in the ground, with many little found artefacts in the tomb. Real digger process. Outdoors, copy space, close up. ; Shutterstock ID 1256987506; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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RAT1RK Experiment with red laser in optics lab

How do two photons become quantum entangled 鈥� and can I do it at home?

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AX21BH Close-up shot, goosebumps

Why does some music give us goosebumps?

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Close-up of construction bubble level.

When a spirit level is flat, what does that mean relative to Earth?

The reading from a spirit, or bubble, level is dependent on many factors, say our readers, including the effect of the moon

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This week鈥檚 new questions

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Why is tea more likely than coffee to leave a stain in a mug?

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What happens to our electronic cloud records when we die? Part 2

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Plants wither away when neglected. Can they also feel pain?

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