Throughout the Pleistocene, climatic changes exerted another type of selective pressure on human biological evolution, contributing to the rapid emergence of various Homo species over time.

The origin of each tube is situated closer to the older of each two consecutive varices, and the tube is bent dorsally and slightly posteriorly.

Oh there once was a swagman camped in the billabong, Under the shade of a coolibah tree, And he sang as he looked at the old billy boiling, 'Who'll come a'waltzing Matilda, with me.'

O welcome, pure-ey'd Faith, white-handed Hope, Thou hovering angel, girt with golden wings!