WaterFrame/Alamy
Why did crocodiles, turtles, lizards and birds survive the Cretaceous-Palaeogene extinction event, but non-avian dinosaurs didn’t?
Fred Zemke,
Grover Beach, California, US
Oscar Collica/Alamy
If Earth was flat, how would gravity manifest?
Terence Partridge,
San Jose, California, US
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