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
LifeWoolly mammoths had testosterone surges like those of male elephants Hormone measurements from the tusk of a male woolly mammoth show these animals went through musth, a seasonal peak in testosterone seen in elephants 51¶¯Âþ