11.   Some researchers believe that so many sperm are required because not one of them will stop to ask for directions.

12.   So is sperm competition a feature of the human mating system, at least in the evolutionary past if not now?

13.   The report, written by a police chemist, Thomas Hickey, said there was no sperm found inside the victim or on her clothes.

14.   When it comes to preserving genetic material from many endangered species for breeding purposes, sperm is the preferred material.

15.   Judge Malcom Muir wrote Friday that even though the sperm is not contraband, allowing her to use it would reward her for committing a crime.

16.   The more active sperm there are, the brighter the color.

17.   There should be no similar cases in the future because sperm cannot be lawfully stored unless it was obtained with written consent, they said.

18.   Upon discharge, he was married but his wife had a difficult time becoming pregnant because his sperm was weak, their doctor said.

19.   A college president says his sperm is the best, pointing to his children, who are all enrolled in universities, as proof.

20.   Sperm is genetic material.