It's three in the morning. You open your eyes suddenly, for no reason, and stare at the ceiling in the dark, wondering what's wrong with you. Good news: there's nothing wrong. This alarm clock isn't a glitch. It's a message two million years old. In this video, we travel back in time to understand
19:04
43:49
42:35
12:33
27:18
16:51
26:40
7:44
186:53
18:21
11:41
15:31
10:15
22:23
18:50
30:08
19:20
11:06
6:52
20:23