902K views · 17K reactions | Truman warned Japan to surrender or face ‘utter destruction.’ When they refused, the atomic bomb was dropped. Some say it saved lives by ending the war quickly. Others call it unnecessary and inhumane. What do YOU think—was dropping the bomb justified? Learn more about the end of the war in "Surrender on the USS Missouri" link in our bio. #wwii #history #wwiifoundation #documentary | The World War II Foundation | Facebook

In 1914 a chemist called Fritz Haber offered his knowledge to the German Army. He soon began experimenting with chlorine gas to be used in trench warfare. In April 1915, 150 tons of lethal chlorine gas was used by the German forces against the French Army at Ypres. Note: For the first attack at Ypres the Germans actually delivered the gas from cylinders using the wind, instead of shells as it looks in the video! | Simple History

27K views · 597 reactions | #OnThisDay 1935: Radar was successfully demonstrated for the very first time. Robert Watson-Watt, one of radar's pioneers, explains how a radio signal bouncing off an aeroplane inspired the technology. | BBC Archive | Facebook