Seven years after the end of WWII, the US detonated the world's first hydrogen bomb.

H-bombs use a combination of nuclear fission and fusion and are far more powerful than atomic bombs.

The world's first nuclear weapon — the atom bomb — devastated the Japanese cities of Hiroshima and Nagasaki in 1945.

With its depiction of the first atomic bomb explosion, the new film, "Oppenheimer," highlights the massive destructive power of these early nuclear weapons.

Radioactive particles from nuclear explosions are found in every corner of the world. Many people are worried about the bad effects of nuclear bombs.

In the event of nuclear war, the ultra-rich can hide away in their luxury bunkers that cost anywhere from $35,000 to $14 million. But what about the rest of us?

Nuclear blasts create dangerous fallout — residual radioactive material that travels high into the air, cools into dust, and eventually settles back to the ground, poisoning it in the process.