Analysis: Why are we so worried about the spread of coronavirus? Think of rice on a chessboard

http://www.abc.net.au/news/image/1031058-16×9-2150×1210.jpghttp://www.abc.net.au/news/2020-04-05/coronavirus-exponential-growth-explained-by-rice-on-a-chessboard/12122214Some commentators claim the Government has put the economy at risk by overreacting to coronavirus, but there’s a reason health officials are so concerned — and a mathematical problem involving rice and a chessboard can explain it.