People who defy earthly forces and dream of high-flying adventures.

Breaking the glass ceiling is never easy, but for some female inventors, science comes at an added price.

Nature is powerful and can snuff out life in an instant, but for three intrepid adventurers, nature holds mysteries just waiting to be discovered.

Some discoveries lie in wait for those brave enough to venture out; from hidden cities in the jungle to dinosaur fossils and seeds in far-flung locales, the prize goes to those willing to take the risk.

Although modern medicine is capable of incredible feats, the ability to treat the human body follows hundreds of years of experimentation -- at times with deadly results.

A look at great thinkers who have left their mark on scientific discovery.