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.
Keith Olbermann Reminds the Teabaggers that They Coined Their Own Name. On his MSNBC show Countdown, host Keith Olbermann reminded the teabaggers, who just now seem to have figured out what the name means, where the term teabagger came from. Hint: it wasnât Maddow or Olbermann but the teabaggers themselves who coined the term.