Why Leonardo da Vinci Clashed with the Church

The Renaissance began with the belief of humanism that spread through the writer.

Discover places across the country where strange phenomena are common in this clip from The UnBelievable.

In 1890, medium Helen Peters helped give the Ouija board its name. But after the board accused a relative of theft and tore her family apart, she spent the rest of her life warning others that its answers might not be truthful.

A failed oil rig causes an environmental disaster, while a NASA miscalculation dooms a Mars satellite—two costly mistakes with multimillion-dollar consequences.