The wheel was likely invented around 6,000 years ago, but a new analysis of curious rocks from Israel suggests that wheel-like technologies existed even earlier.

Earth and environmental sciences cover all aspects of Earth and planetary sciences, and broadly encompasses solid Earth processes, surface and atmospheric dynamics, Earth system history, climate ...

“The Olympic symbol consists of five interlaced rings of equal dimensions (the Olympic rings), used alone, in one or in five different colours. When used in its five-colour version, these colours ...