German Klaus Hasselmann poses for a picture after winning the 2021 Nobel Prize in Physics, in his home in Hamburg, Germany, October 5, 2021. Scientists Syukuro Manabe, Klaus Hasselmann and Giorgio Parisi won the 2021 Nobel Prize for Physics for their "groundbreaking contributions to our understanding of complex physical systems," the award-giving body said on Tuesday. REUTERS/Fabian Bimmer