"Arithmetic, Population and Energy" may very well be one of the most important videos you're likely to watch. While the math behind the exponential function ...
"Cowards die many times before their deaths; The valiant never taste of death but once. Of all the wonders that I yet have heard, it seems to me most strange that men should fear; Seeing that death, a necessary end, will come when it will come." -- William Shakespeare (Julius Caesar)