Famed screenwriter Charlie Kaufman and theoretical physicist Brian Greene dissect time as we know it. What is the smallest unit of time, and what does it look like? For starters, you should stop looking at the clock, and start looking at the universe.
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A new warning from astrophysicist and global science guru Stephen Hawking: Do not talk to aliens.
The brilliant Hawking is wheel-chair bound and speaks through a computer. But he’s thinking about the cosmos.
With billions of galaxies, trillions of stars, the numbers tell him there’s life out there. The smartest forms could make it here. But we should not want that, says Hawking. Too much danger.
Other scientists disagree. We’ll hear that debate, and talk to the man who heads Earth’s greeting committee for aliens.