A natural gas drilling rig just east of downtown Fort Worth, Texas. A new decade-long study finds the region's Barnett Shale formation has sufficient gas reserves to last another 25 years. David Kent/MCT/Landov/Fort Worth Star Telegram hide caption

itoggle caption David Kent/MCT/Landov/Fort Worth Star Telegram

Space tourist Dennis Tito celebrates after his landing near the Kazakh town of Arkalyk on May 6, 2001. Alexander Nemenov/AFP/Getty Images hide caption

itoggle caption Alexander Nemenov/AFP/Getty Images

"Only the hand can tell where it's tender, where the patient winces." — Abraham Verghese James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED