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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?

Any spinning disc would be torn apart long before it reached the speed of light, say our readers

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

2CA4Y7K Comet crashing into earth

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

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

This week鈥檚 new questions

Environment

Dramatic images show where water and humanity meet

Twisteddoodles on when facial recognition tech goes wrong

Tom Gauld on the necessity of good supportive evidence

Mathematics

The 19th-century maths that can help you deal with horrible coffee

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?

2CA4Y7K Comet crashing into earth

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

If an antimatter meteor came into our solar system, we鈥檇 definitely know about it, says one reader, especially if it hit the sun

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

This week鈥檚 new questions

Comment

Kim Kardashian has wrangled an invite to NASA HQ. Can we get one too?

Technology

Remarkable robot images provide a vision of the future