I recently came across two parallel attempts to convey how much information can be stored in so little space. On your left, we have Bill Gates comparing the information stored on a CD comared to a stack of paper the height of a house. The fact that Gates looks young, shows just how ancient CDs are. On your right is Margaret "NASA" Hamilton [bloboprev] showing how much code she wrote for the operating system of the Apollo space program. If you bought your external hard-drive (for back-ups) recently, it is likely to have 1 terabyte of storage capacity. That's 1000x more than Bill Gates' CD! Hamilton's stack was keyed into the Apollo computers which had a tiny 72 kb of memory: it weighed 30 kg! The CD has about 10,000x the capacity of the instrument that flew to the Moon and back.