Water: The Key to Life and DNA

Scientists hunting for aliens are really just looking for water. That's because all

life as we know it started in water and still depends on it. The secret is hydrogen

bonds. These tiny connections between water molecules are strong enough to pull water up

the tallest trees. But here's the wild part: the exact same type of bond holds your DNA together.

The two strands of your genetic blueprint are linked by millions of these weak hydrogen bonds.

And that genetic code? It's universal. The same code that builds you is used

by bacteria, plants, and every living thing.