nereid666 writes "An amazing experiment shows that to send a single icmp echo to all the ip adresses of the world costs only 10hours on a normal server, and the results are interesting too, A 7% of adresses answer to this pings." Link to Original Source
The F-15 Eagle:
If it's up, we'll shoot it down. If it's down, we'll blow it up.
-- A McDonnel-Douglas ad from a few years ago