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Last Word

Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

This week’s new questions

How long would a race need to be for a human to beat a cheetah? And if all the water on Earth’s surface, and in the air, were put into a ball, how large would the sphere be?

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Child's Spinning Top Toy; Shutterstock ID 365058569; purchase_order: -; job: -; client: -; other:

What would happen if a spinning disc approached the speed of light?

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CHEETAH acinonyx jubatus, Adult running through Savannah ; Shutterstock ID 1652757304; purchase_order: -; job: -; client: -; other:

Must the evolution of an adapted trait in nature reach a limit? Part 2

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2CA4Y7K Comet crashing into earth

How would we spot an antimatter comet in our solar system? Part 2

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cofee cup on the sand at the sunset; Shutterstock ID 1450632401; purchase_order: -; job: -; client: -; other:

This week’s new questions

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CHEETAH acinonyx jubatus, Adult running through Savannah ; Shutterstock ID 1652757304; purchase_order: -; job: -; client: -; other:

Must the evolution of any adapted trait in nature reach a limit?

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2CA4Y7K Comet crashing into earth

If an antimatter meteor came into our solar system, how would we know?

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2M5GPCD Preparations of plants with bubble wrap for the winter

Should bubble wrap face the inside or outside of the object? Part 2

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This sequence of artist's illustrations shows how a black hole can devour a bypassing star. 1. A normal star passes near a supermassive black hole in the center of a galaxy. 2. The star's outer gasses are pulled into the black hole's gravitational fie

This week’s new questions

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Disappointed woman packing for a journey: she is standing in front of her suitcase overfilled with clothes, travel and vacations concept; Shutterstock ID 2314449417; purchase_order: -; job: -; client: -; other:

How do you get the most clothes into a suitcase?

The trick to packing your suitcase is getting rid of the air between items of clothing, say our readers

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What happens if an entangled particle falls into a black hole?

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Why do rainbows refract light into many colours but not clouds? Part 2

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Is short-sightedness found in other animals? Part 3

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This week’s new questions

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