Viruses that lead to important diseases have brought their discoverers the 2008 Medicine Nobel Prize.
Mr Harald zur Hausen (Heidelberg, Germany; left) gets 1/2 of the prize for his discovery of human papilloma viruses causing cervical cancer.
The other 1/2 of the award is shared by Ms Françoise Barré-Sinoussi (middle) and Mr Luc Montagnier (both Paris, France; right) for their 1983 discovery of human immunodeficiency virus (HIV).
Surprisingly, Thomson Reuters didn't think of that. None of their guesses had anything to do with cancer or AIDS.