How hydrogen bombs work and why they were created after WWII despite being more powerful than atomic bombs

• 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.
• Edward Teller, a physicist at Los Alamos, is often referred to as the "father of the hydrogen bomb."

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