Johann Gutenberg invented the printing press. He was born about 600 years ago in Germany, and his father was a goldsmith. Gutenberg learned how to melt and form metals and used this knowledge when he was inventing the printing press. Many inventors use skills and knowledge they already have to create something new that helps other people.
Nine-year-old Chris Hass invented a basketball that shows players where to put their hands when they shoot a basket. He got the idea when his friends were missing easy shots because they did not know how to hold the ball correctly. Today, these basketballs are sold around the world.
Both of these inventors used information they already knew to make something new for other people to use. You don't have to be an expert to invent something; anyone can do it!