Season 4 - Episode Guide

Scientists explore the effects of the Higgs Boson discovery, which validates the Standard Model in particle physics and solidifies the understanding of subatomic particles; highlights include an in-depth discussion of the Higgs field and mass.

We can all trace our lives back to a beginning. But what defines the beginning? Is it the moment when two cells unite? Or does something have to know it is alive before its life can begin?

We are all at the mercy of the Sun. Its glowing disc sustains nearly all life on Earth. But the Sun also holds a dark secret: someday, our aging, expanding star will bathe the Earth in a fiery holocaust. Everything we know will turn to hot, bubbling, plasma.

If the stuff of life is spread throughout the cosmos, then the universe could be teeming with aliens. Will alien brains think in ways we understand?

Every single person who has ever lived was created from the genes of one man and one woman. But human sexual reproduction, unchanged for millions of years, is about to undergo radical change.

Our minds store our entire lives, our memories and our deepest desires. Tell no one, and our thoughts remain our own. But our brains are biological computers. Computer hackers can tamper with our email. Could brain hackers someday be able to rewrite our thoughts?

We are in the midst of a revolution so insidious we can't even see it. From our telephones to our vacuum cleaners to our cars, we have robots that live and work beside us. And now we're designing them to think for themselves, giving them the power to learn to move on their own.

Do we live in the "real world," or is it all in our mind? Our basic assumptions about life and the universe may be false. Is nothing certain? Or is reality real?

We like to think we are the masters of our fates. But is that really true? What if everything that has happened or will happen in the universe has already been set, from the Big Bang to the Last Gasp, and we are unable to change our inevitable destinies?

What or who created all of the billions of species that have lived on Earth? Is all life the product of evolution as Charles Darwin proposed or was it the guiding hand of a higher power?