39:59

Everything Matters | Gallium | Ron Hipschman | Exploratorium

33:45

Por Que Era Quase Impossível Criar o LED Azul

35:27

Everything Matters | Zinc | Ron Hipschman | Exploratorium

42:24

Everything Matters | Nickel | Ron Hipschman and Chuck Mignacco | Exploratorium

47:18

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

53:30

Glow Science | After Dark Online

47:34

Everything Matters | Argon | Ron Hipschman and Chuck Mignacco | Exploratorium

57:36

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