Leaning from a low-flying helicopter to shoot a fast-moving military boat. Zooming in on a tiny bee equipped with a radio transmitter. Feeling the heat while snapping a car explosion just meters away. These are a few of the adventurous scenarios John B. Carnett has found himself in while on assignment for Popular Science. In this slideshow, our esteemed staff photographer tells us what´s going on behind the scenes of a few of his choicest pics.