flights of discovery, run by the drummond foundation, a division of that major defense firm. the company grabs science and math teachers from across the u.s. to get on these flights, videotape themselves having a blast at zero gravity and show it to their students. experiments are mixed in and are purposely part of the fun. >> we get the teachers to see if body weight had any effect on their travel time. >> so you actually tossed a teacher. >> we toss aid teacher. >> how does it work? we're seated when the plane first startsz to climb. then as we level off, we all have to lie on the floor of this padded cabin. we're taken on a series of so-called perabulas. it takes a series of climbs and then dives for about 30 seconds. >> when the plane dives, we're at zero gravity.