From Wired.com’s This Day in Tech: “Aug. 18, 1868: Helium Discovered During Total Solar Eclipse,” http://www.wired.com/thisdayintech/2009/08/dayintech_0818/
From Wired.com’s This Day in Tech: “Aug. 18, 1868: Helium Discovered During Total Solar Eclipse,” http://www.wired.com/thisdayintech/2009/08/dayintech_0818/