EarthCalculations may have overestimated extinction rates Species are being driven to extinction – but perhaps not as rapidly as we thought, because of a mathematical error that has gone unnoticed for decades 51¶¯Âþ
EarthWhy have so many tornadoes hit the US this month? April has been a deadly month for the US tornado states. 51¶¯Âþ explains how severe the outbreak has been, and what has caused it 51¶¯Âþ