HumansThese ancient sand drawings could be a fifth type of palaeoart Was this perfect circle with a central depression drawn by our ancestors in the sand, around 136,000 years ago? Palaeontologist Charles Helm certainly thinks so Regulars
HumansCan we ever know who invented the wheel? Some of the most important inventions – wheels, nets and the written word – have creators lost to time, even though their impact shaped the world we live in News