The Atom & its Parts Science 3 working physicist studying Astronomer Particles strain the imagination Some measure less than a trillionth of a centimeter across Some may exist for only a trillionth of a second Time:1:50 WPM:66.6

Smallest particle of a chemical Molecules molecules Smallest particle of a chemical independent existence Single-atom unusual tendency Science 4 Time:2:14 WPM: 65.1

The Supercontinent Science 5 Serious study German meteorologist Alfred Wegener Serious study Dismiss by others Also Wegener Could be explained about India and the southern countries Had separated Gondwanaland Time:2:29 WPM: 68

Steam Power Created steam James Watt history The age of steam In ancient Greece Alexandria devices Machine 1 Time:2:10 WPM: 66.6

The Human Brain In 1963 Sir John Eccles Human brain Novel prize Mind 1 Novel prize Sir John Eccles In 1963 Human brain The human nervous system Sometimes compared Millions of miles of wire Time:2:27 WPM: 60.8