A terrific discovery in Paleontology (Nature) : the fossil of the skull of a whale (3 m. long), very alike to the skeleton of a sperm whale in size and in appearance. This whale seemed to be a very aggressive predator : a massive jaw with huge teeth, teeth on the upper and lower jaws, probably 17m. long. The team call this whale : Leviathan melvillei. Watch the nice video and read the article. A summary of both can be found at the BBC.
Note also a very important step in Mathematics : the conjecture de Poincaré is now considered a theorem, thanks to G. Perelman. See Pour la Science.
MAJ (3/07/2010) : Perelman did not accept the prize associated with the solving of the problem. See : Brilliant & reclusive Russian Mathematician doesn't need your money.