Updated Mar 03, 2021 | 16:28 IST Other inventions, discoveries, and ideas found during the two World Wars that we still use are trench coats, sanitary pads, Daylight Saving time, the wrist watch, jet engines, ballpoint pens etc. World War I and II caused huge loss of lives. The inventions from the period are listed here.  |  Photo Credit: iStock Images Key Highlights Wars should never occur, as the loss of lives, the damage to peace and health are humongous. But the Second World War saw the creation of clever inventions we still use today. These inventions can never justify the event of World War, but do check this list of the researches done then that helped mankind later.