The warning that the Al Kibar strike sends out.

Israel’s recent disclosure that its air force reduced Syria’s Al Kibar atomic bomb facility to rubble came across as one of the worst kept secrets in modern history.

Products that reflect heat, such as emergency blankets, have existed for decades.

Evading detection by an infrared camera, octopus style.

The Russian nuclear submarine Dmitrij Donskoj sails through Danish waters in July 2017.MICHAEL BAGER/AFP/Getty Images

What Would Really Happen If Russia Attacked Undersea Internet Cables.