Usually, it's because the sperm gets into the fallopian tube before the egg is released. Once there, the sperm wait for an egg to arrive. After fertilization, it can take 5-10 days for the fertilized egg to begin to attach itself to the lining of the uterus. Pregnancy begins when this happens.
The arrangement of spikes originally had no distinct name; the term Thagomizer was coined in 1982 by cartoonist Gary Larson in his comic The Far Side, and thereafter became gradually adopted as an informal term within scientific circles, research, and education.
roflcopter. Invented by a Blizzard moderator on the Warcraft III forum. There is always much whining going on on those official forums, much sucking up to moderators and an awful lot of 'BLUE!!!o when one invented this new buzzword, it was grabbed and squeezed out and spread like a virus across all of the Blizzard forums and from there over the internet. The word is derived from a unit in Warcraft III, the gyrocopter (flying machine).