22:59

Everything Matters | Lithium | Ron Hipschman | Exploratorium

47:18

The 10,000 Year Clock | Alexander Rose | Talks at Google

19:43

Everything Matters | Helium | Ron Hipschman | Exploratorium

38:14

Everything Matters | Sodium | Ron Hipschman | Exploratorium

25:50

Everything Matters | Gallium | Srabanti Chowdhury | Exploratorium

57:36

Construction of the 10000 year clock - Alexander Rose (SETI Talks)

31:15

Everything Matters | Beryllium | Dr. Jay Daniel | Exploratorium

28:50

Everything Matters | Chromium | Ron Hipschman | Exploratorium