Thermonuclear bombs (H bombs) are believed by scientists to be more powerful but not as common as atomic bombs (A bombs).
Thousands of people worked at Oak Ridge in Tennessee in the 1940s, unaware that this was where the US used to build an atomic bomb.
More than 8,000 real-life terracotta warriors were discovered in the tomb of Emperor Qin Shihuang in Xi'an, China, in 1974.
An unbearable feeling, a sudden heat covering the whole body, that is the effect of ultra-strong electromagnetic rays emanating from a notorious anti-aircraft weapon of the US