BASE jumping is the hair-raising pastime of leaping off tall, fixed objects instead of out of planes, for example. It's a great name because it works as-is and is also an acronym—which I didn't realise for years. BASE stands for the types of fixed objects BASE jumpers might throw themselves off: Buildings, Antennas (like radio or communication towers), Spans (i.e. bridges), and Earth (like a cliff or natural formation). Just to be clear—I'm not recommending you try it out =)
