Piano Keys: In an octave, there are a total of 13 keys (8 white and 5 black, arranged as 2 and 3).

Life reconstruction of fossil Asteroxylon mackiei. Credit: Matt Humpage, Northern Rogue Studios A 3D model of a 407-million-year-old plant fossil has overturned thinking on the evolution of leaves.

Leaf arrangements in the earliest plants differ from most modern plants, overturning a long-held theory regarding the origins of a famous mathematical pattern found in nature, research shows. The ...