In the first half of the 20th century pioneering geneticist Nikolai Vavilov traveled 5 continents assembling a treasury of the worlds seeds. He dreamed that science could be the means to end hunger. His refusal to tell a scientific lie cost him his life. The heroism of his colleagues and its direct impact on your life is one of the most stirring stories in the history of science.

The episode was rated 8.06 from 129 votes.

An adventure spanning billions of years into the evolution of life and consciousness. A visit to a 100,000-year-old laboratory. The story of the change in life-style that radically altered human existence and the life of the heretic who found god in the book of nature, opening our way to the stars.

The episode was rated 8.06 from 194 votes.

A new vision of genesis at the bottom of the blood red sea of the infant Earth. And the story of the man who found the first clues to life's beginning in a green jewel. As he searched for life's origin, he risked his own, daring to toy with his Nazi tormentors.

The episode was rated 8.02 from 133 votes.

How a deadly embrace between science and state altered the fate of the world, and a gripping cautionary tale of mass casualty and unlikely survival.

The episode was rated 7.84 from 102 votes.

A child lies on the rug of a tenement dreaming of interstellar adventures. At the dawn of the space age, a young Carl Sagan's career is forged in the clash of his mentors, two scientific titans. Sagan goes on realize his childhood dreams, to carry their research forward and communicate its significance to the whole world.

The episode was rated 7.83 from 120 votes.

A revelation of the hidden underground network that is a collaboration of four kingdoms of life, and a true first contact story between humans and beings who communicate in a symbolic language and have maintained a representative democracy for many tens of millions of years.

The episode was rated 7.81 from 116 votes.

An exploration of human potential for change, concluding with the story of one of history's greatest monster and his virtuous transformation.

The episode was rated 7.78 from 105 votes.

A baby is born on the day the show premieres. What kind of world can she expect to grow up in? One of her possible futures is explored.

The episode was rated 7.70 from 105 votes.

A voyage of discovery through the evolution of consciousness with stops in ancient Greece, a visit to the largest life form on Earth, into the poignant dream of an abandoned orphan that opened the way to our understanding of the architecture of thought and beyond to a vision of a galactic network of thought.

The episode was rated 7.56 from 114 votes.

Take a trip to the 2039 New York World’s Fair, where the problems we now consider hopeless have been solved and thrilling possibilities exist.

The episode was rated 7.45 from 92 votes.