700 yrs ago, give or take.
China
A young gun is a rising talent or a newly-discovered prodigious star in his or her field.
Dr. Harry Coover discovered it while he was researching acrylic for aircraft gun turrets for 3M.
It was not discovered, it was invented (made) by Hiram Maxim.
Yes. You can get the thunder gun on moon, the problem is that it has never been discovered.
I was going to fight back until I discovered the robber weilded a gun.
China was the first to discover gun powder, is that what you mean.
Video games weren't "discovered", they were designed.
They first discovered gun powder in the 13th century while visiting China.
The trebuchet stopped being used when the rulers discovered gun powder and the trebuchet lost fame and was forgotten.
they killed hitler with a bb gun and discovered chili
Super glue was discovered in 1942 by Kodak (Coover/Joyner) during experiments to make plastic for gun sights. Though that effort failed, it was discovered that the cyanoacrylates glued many things quickly. Kodak quickly developed Eastman #910, calling it "Super Glue".