The largest contiguous wilderness area in the 48 lower states, Central Idaho's Frank Church - River of No Return Wilderness, is defined by endless rugged mountains, wild rivers, forests and deep canyons. Explore it and get to know its numerous species of wildlife - including wolves who have just returned after 50 years of near absence - with "Nature" at 7 p.m.
Stay tuned afterwards to find the answer to an important question: Is our solar system a deadly celestial shooting gallery with Earth in the cross-hairs? Join the NOVA crew as they hit the ground in Russia along with impact scientists as they hunt for debris from the Siberian Meteor explosion of February 15. Together, they'll look for clues to the origin and makeup of the 7,000 ton asteroid that exploded near the Ural mountains with the power of 30 Hiroshima bombs. The crew also investigates what the chances are that another, even more massive meteor could strike in the near future.
Finally, at 9 p.m., David Pogue will take us through the world of weird, extreme chemistry on a quest to unlock the secrets of the elements. Why are some elements, like platinum and gold, relatively inert, while others, like phosphorus and potassium, are violently explosive? Why are some vital to our every breath while others are potentially lethal? Find out with surprising - and often alarming experiments - on a roller coaster ride through nature's hidden lab on "NOVA"!