Upbeat news on a possible coronavirus treatment powers U.S. stocks, lifting Dow more than 500 points

https://www.washingtonpost.com/business/2020/04/29/stocks-markets-today-economy-coronavirus/?wpmk=1&wpisrc=al_news__alert-economy--alert-national&utm_source=alert&utm_medium=email&utm_campaign=wp_news_alert_revere&pwapi_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJjb29raWVuYW1lIjoid3BfY3J0aWQiLCJpc3MiOiJDYXJ0YSIsImNvb2tpZXZhbHVlIjoiNTk2YWZiMThhZTdlOGE0NGU3Y2Y3OWI1IiwidGFnIjoid3BfbmV3c19hbGVydF9yZXZlcmUiLCJ1cmwiOiJodHRwczovL3d3dy53YXNoaW5ndG9ucG9zdC5jb20vYnVzaW5lc3MvMjAyMC8wNC8yOS9zdG9ja3MtbWFya2V0cy10b2RheS1lY29ub215LWNvcm9uYXZpcnVzLz93cG1rPTEmd3Bpc3JjPWFsX25ld3NfX2FsZXJ0LWVjb25vbXktLWFsZXJ0LW5hdGlvbmFsJnV0bV9zb3VyY2U9YWxlcnQmdXRtX21lZGl1bT1lbWFpbCZ1dG1fY2FtcGFpZ249d3BfbmV3c19hbGVydF9yZXZlcmUifQ.nVHv50yfBxuWEoQvSHAzab6Ll9pzZ79Az0mxexPrFc0