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.
Thalidomide was first marketed in 1957 in West Germany under the trade-name Contergan. The German drug company Chemie Gruenenthal grÃ¼nenthal developed and sold the. Drug primarily prescribed as a sedative or, hypnotic thalidomide also claimed to  cure, anxiety, insomnia, gastritis and. tension