Can lessons learned from the Twin Towers' collapse make new buildings safer?

The air war in Afghanistan showed that sometimes the hottest pilots are sitting on the ground operating the remote controls of UAVs—or unmanned aerial vehicles. In newly declassified footage, "Spies That Fly" reveals the astounding capabilities of UAVs and the ambitious plans for future models.

In "Origins: Where are the Aliens?," host astrophysicist Neil deGrasse Tyson explores such provocative questions as: would "ETs" resemble us or the creatures of science fiction? Are there "aliens" already amongst us on Planet Earth—brainy creatures whose intelligence is very different from our own? And are planets on which life can flourish rare or common in our universe?

Can lessons learned from the Twin Towers' collapse make new buildings safer?

As Governor of California, Arnold Schwarzenegger launches a dramatic and controversial program to slash carbon dioxide emissions and promote energy efficiency. NOVA explores the pros and cons of California's bold approach, which calls for improvements in energy efficiency in homes and commercial buildings; increased reliance on renewable power sources, primarily solar and wind; and major upgrades in car mileage. Hear from Governor Schwarzenegger, skeptics and supporters of the plan, and ordinary citizens and businesspeople whose lives are impacted. Among those interviewed is Steven Chu, who went on to become the U.S. Energy Secretary in the Obama Administration.

In the aftermath of his 1927 solo transatlantic flight, Colonel Charles Augustus Lindbergh–the Lone Eagle–became the most famous human being on earth. And when he and his lovely wife Anne produced an adorable baby son, Charlie, an eager press quickly dubbed him Little Lindy or sometimes just the Eaglet. But on the evening of March 1, 1932 Lucky Lindy's luck ran out. Bold kidnappers snatched his baby from the family home near Hopewell, New Jersey, while everyone in the house was awake. Negotiations with the kidnappers stretched out for weeks. But Little Charlie never came back. His body was discovered not five miles from Hopewell. Now, NOVA is reopening one of the most intriguing, grisly, and confounding crime mysteries of all time as a team of expert investigators employ state-of-the-art forensic and behavioral science techniques in an effort to determine what really happened to Lindbergh's baby and why.