A 9-year-old boy was nearly swept over a 300-foot waterfall at Yosemite National Park on Saturday — until he was saved by someone not very much older than himself. Alec Smith, 16, after hearing the mother’s cries, leapt over a protective fence and jumped into the raging Merced River, pulling the boy to safety just yards from the massive drop over the Vernal Falls waterfall. Alec was philosophical about the rescue, which park rangers said put him at considerable risk: “Don’t think about what could have happened,” he told the San Jose Mercury News . “Be grateful for what did happen.”