21.   Divers on the surface watched for a slick to form, meaning eggs were being fertilized.

22.   Embryos are created by fertilizing an egg with sperm in a laboratory and letting it divide into eight cells before being frozen and stored.

23.   Embryos are discarded every day by clinics that fertilize eggs to implant in women who cannot otherwise conceive.

24.   Eggs are fertilized by the best available sperm.

25.   For decades, biologists have been searching for a crucial protein on the heads of sperm that allows them to fertilize eggs.

26.   Fertilized eggs?

27.   Goto wants to take mammoth sperm cells frozen in the Siberian tundra, use them to fertilize the egg of an Indian elephant and repeat for generations.

28.   Hanson said sperm usually live in the cervical mucus for a couple of days, during which time they mature and become capable of fertilizing an egg.

29.   He cannot fertilize the eggs he creates unless he intends to implant them because his hospital does not allow him to do embryo research.