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0:55 Epidemiology
The Maths of Herd Immunity
1:09 Cartography
Africa Is 14 Times Bigger Than Greenland
0:50 Seismology
Why a 7 Is So Much Worse Than a 6
0:54 Optics
Why a Rainbow Is Always a Circle
1:07 Chronobiology
Why Jet Lag Is Worse Flying East
0:53 Materials science
The 1,900-Year-Old Concrete Dome
0:48 Acoustics
Why Your Recorded Voice Sounds Wrong
1:04 Paleontology