Carl Sagan on atoms, the googol, and the googolplex

Atoms, the googol, and the googolplex. Carl Sagan explains how numbers such as one-thousand, one-million, one-billion, and so are expressed in scientific notation. The googol is a 1 followed by 100 zeroes. This clip comes from Carl Sagan's Cosmos episode 9, "The Lives of the Stars."