11.   As the researchers have discovered, it is difficult to perfect the online buying experience.

12.   At another address, researchers discovered glass beads and a ceramic head, possibly of Teddy Roosevelt.

13.   Belgian researchers have discovered that it can.

14.   -- Medical researchers will discover that the HIV virus has nothing to do with AIDS.

15.   British and French researchers have discovered that this holds true even when the species is the tiny malaria parasite Plasmodium and the environment is blood.

16.   But as researchers lately have discovered, many bullies in fact are quite popular.

17.   But researchers have discovered that certain proteins found in every cell of the body play a role in alerting the immune system when something goes awry.

18.   But the African women have a secret weapon, the researchers discovered.

19.   But this summer researchers discovered that large numbers of monarch caterpillars live on milkweed in cornfields.

20.   But University of Tennessee researchers have discovered in laboratory experiments the fertile hybrid ant can live longer in cold temperatures than either of their parents.