Scientists have discovered what they claim to be the earliest-known human drawing in Blombos Cave, 300 kilometres west of Cape Town, South Africa.

A London-based dentist has uncovered a hidden detail in Leonardo da Vinci ’s famous Vitruvian Man drawing, revealing a special number connecting the iconic artwork to the human body and nature.

The earliest known drawing in human history – a red, cross-hatched pattern that looks somewhat like a hashtag – has been unearthed on a rock in South Africa.

The earliest known drawing made by a human has been found in a South African cave and it looks very similar to a hashtag, the grouping and search feature made popular by Twitter.

Understanding human decision-making has been a central goal in psychology for decades. Researchers have long sought to design ...