Have you ever struggled with the concept of quantum measurement, feeling it’s unnecessarily abstract? You’re not alone. Enter ...

Underneath South Dakota's rolling Black Hills region, there is a sparkling national monument that is considered one of the world's longest caves.

Only very young - Pleistocene - fossils are preserved this way. 7. Recrystallization: The original skeletal material has grown into new crystals. The process may be aragonite crystallizing to calcite, ...