that would be like if there was a cube on which each set of opposing sides were connected — meaning that no matter how large the universe appears, if you peer deep enough into its depths ...

What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth." ...

Many of the atoms you're made of, from the calcium in your bones to the iron in your blood, were brewed up in the heart of an exploding star billions of years ago.