Most teachers would be happy to keep their students as far away from scorpions as possible. But not Cameron Elementary School teacher Sheryl Marino.

Mike Keller has studied Yellowstone’s thermal features and volcanic underworld since high school, and when he’s not busy directing operations for the park’s concessioner, he spends most of his free time geyser gazing. As the president of the Geyser Observation and Study Association, Mr. Keller possesses both an extreme passion and an extensive knowledge about all things geothermal.

A brass quintet inside Mammoth Cave? That's on the schedule for the annual Cave Sing at Mammoth Cave National Park, which will celebrate the coming holidays with an event to bring the surrounding community together.