Boltysh crater in Ukraine formed around the same time as the Chicxulub event, raising questions about its role in this tumultuous era.

Collectors are surging again to own a bit of natural history, be it an ancient shell, an animal's tooth or a full dinosaur skeleton for the foyer.

Bats roosting in caves produce ample guano, which may explain why prehistoric marks left by humans cannot be found in some places where they are expected.