Tufas indicate prolonged periods of water availability linked to human occupation in the southern Kalahari. - von der Meden, Jessica; Pickering, Robyn; Schoville, Benjamin J.; Green, Helen; Weij, Rieneke; Hellstrom, John; Greig, Alan; Woodhead, Jon; Khumalo, Wendy; Wilkins, Jayne (PLoS ONE, 2022)