This week鈥檚 new questions
Which animals can recognise individual people? And does Earth鈥檚 mass remain constant?
Regulars
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Which animals can recognise individual people? And does Earth鈥檚 mass remain constant?
If two particles were entangled and one fell into a black hole, what happens to the other? And are 鈥渟pace ports鈥� that spin slowly to create artificial gravity feasible?