Every bit of information can make a difference in a disaster. Just ask Tilly Smith.
In December 2004, the 10-year-old English schoolgirl was vacationing on the coast of Thailand with her parents and her younger sister Holly.
"It was like paradise -- white sand and blue turquoise sea," Tilly remembered.
On the morning of Dec. 26, the family went for a long walk on the beach. But Tilly, now 14, noticed something was very different about the ocean that day.
"The water was really, really...Full Story