Hawk Thermals

"That was the coolest thing I've ever done in my life," Tobias said. His whole face was glowing. "I was riding the thermals."

"What's a thermal?" I asked.

"That's when there's warm air rising up from the ground. It forms this cushion under your wings. You can just float up there. Like a mile up! You just surf the thermals. You guys have got to do it! It is the best thing ever."