RogerAnderson, a geophysicist and director of the Energy Research Center at Columbia University's Lamont-Doherty Earth Observatory, says that the discoveries may have only begun.
Before that, Sunday's fourth-round men's matches are: 17-time major champion Roger Federer against 15th-seeded Gilles Simon, No. 4 David Ferrer against No. 23 Kevin Anderson, No. 6 Jo-Wilfried Tsonga against Viktor Troicki, and No. 11 Nicolas Almagro against No. 32 Tommy Robredo.