In this audio slide show, Dr. Dana Dolinoy of Duke University explains the role that the epigenome, a sort of second genome, plays in regulating the expression of our genes. As Dolinoy notes, we can ...

For decades, rumors of alien spacecraft at Area 51 have captivated the public imagination. In what is now known as one of the most infamous government cover-ups, an absence of information fueled wild ...

This one-hour program is divided into five chapters. Choose any chapter below and select QuickTime or Windows Media Player to begin viewing the video. If you experience difficulty viewing, it may be ...

Three women at risk of developing Alzheimer’s join a groundbreaking study to try to prevent the disease, while sharing their ups and downs, anxiously watching for symptoms, and hoping they can make a ...

How is it that two bicycle-shop owners from Dayton, Ohio, managed to do what many others before them had tried but failed to do—invent the airplane? In this interview, Wright biographer and ...

(This program is no longer available for online streaming.) In October 2007, a striking portrait of a young woman in Renaissance dress made world news headlines. Originally sold nine years before for ...

Editor's Note: On the night of March 24-25, 1944, 76 Allied prisoners of Stalag Luft III, a German prison camp in Sagan, 100 miles southeast of Berlin, escaped through a tunnel named "Harry." Within ...

Take a seat on the ultimate thrill ride as NOVA explores the universe’s strangest objects.

Complete transcripts of NOVA programs are typically available about three weeks after the original program broadcast date. Transcripts for programs airing after January 7, 1997 can be found on this ...

In this feature, you will be faced with an ethical dilemma that is illustrated with ideas and imagery you might find repugnant, even abhorrent. In addition, this feature may not be suitable for ...

The birth of writing and the first alphabet were among the world’s most vital inventions.

In ancient Egypt, when pharaohs wanted to record something for eternity and have it be known not only to mortals, but more importantly, to the gods, they wrote in stone. The hieroglyphs carved into ...