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.
Origin of boondoggle Coined before 1929 by Robert H. Link, American Eagle Scout, as a name for a braided leather decoration, perhaps on the model of earlier woggle Boy Scout's braided leather neckerchief fastener in the shape of a Turk's-head or toggle Sense 1, from a public controversy that emerged in 1935 after New Deal funds were used to provide instruction for the unemployed in handicrafts such as leather braiding