21.   -- Tiny amounts of a mineral called magnetite in their brains help birds follow the magnetic fields around the earth.

22.   A CCD, a semiconductor chip that is sensitive to even tiny amounts of light, measures light intensity and converts it into voltage.

23.   A new treatment that involves injecting tiny amounts of an antiviral drug directly into the eye appears to control an infection that blinds many AIDS patients, researchers say.

24.   A person who had only a tiny amount, he said, would dilute the germs with filler to increase the number of letters that could be sent.

25.   A tiny amount of liver also sometimes gives a numbing sensation, a very mild form of the paralysis that can also kill.

26.   A tiny amount.

27.   A tiny amount even came from Hawaii, according to the study.

28.   Both procedures use an ultraviolet eximer laser to remove tiny amounts of tissue to flatten the surface of the cornea, the clear front layer of the eye.

29.   But he stressed that mosquitoes can breed in tiny amounts of water in containers that could be transported in many ways, such as air and highway travel.

30.   But Horne has a tiny amount he still carries with him in a plastic bag.