Bertens stuns world number one Barty in WTA Finals
70 days ago
Bertens won 3-6, 6-3, 6-4 in two hours and nine minutes in a see-saw match featuring 12 breaks of serve.
Water quality: The world's 'invisible crisis'
137 days ago
World map of water quality around the world based on an index of key indicators from 2000 to 2010, according to a World Bank study.