11.   Australian scientists have discovered a rare strain of the AIDS virus with an unexpected chink in its genetic armor.

12.   Australian scientists have recently discovered a spectacular group of octopuses, called mimic octopuses, which can change shape to impersonate other marine animals.

13.   Beginning with the atom, logically enough, he explains how various turn-of-the-century scientists discovered the electron.

14.   Berkeley scientists have discovered two new elements, the heaviest ever seen.

15.   A dozen years ago, scientists discovered the reason.

16.   According to what I read in the newspaper, scientists have discovered a fat gene that predisposes our girth, no less than growth genes decide our height.

17.   After all, NASA-sponsored scientists discovered only organic compounds and fossils that indicate that some tiny microbes once lived on the Red Planet.

18.   After a worldwide search for families with a rare inherited disorder, scientists have discovered for the first time a gene that affects aging in humans.

19.   After scientists discovered the AIDS virus, for example, they could test samples kept frozen for many years to determine whether the infection was present in the past.

20.   Buildings owned by Aum Shinrikyo in Japan have previously emitted noxious fumes, and last year scientists discovered a byproduct of sarin outside the compound.