The birth of the gas mask
On April 22, 1915, in an attempt to turn the tide in World War I, Germany unleashed 180 tons of chlorine gas on the positions of British and French troops, poisoning 5,000 allied soldiers and killing them instantly. This was the first large-scale gas war in world military history. The British and French allied forces, which suffered heavy losses after the battle, urged the local government to make anti-virus equipment as soon as possible. Soon, the two countries sent dozens of their best scientists to