There is a few inventions that are not very useful. The most known invention that is not useful is the toilet paper roller.
The very first inventions: the lever and the inclined plane. The lever later became the wheel, and the inclined plane became roadways up mountains and screws, and so on. Most of our current machinery is based on these two primal inventions. Other than inventions, the discovery of fire made a huge difference, but it took more inventions to harness fire and make it be useful.
There are many useful inventions of science. The answers vary. Some believe the number one invention that is the most useful in science is the electric furnace. It was made in 1889. The electric furnace converted aluminum to metal that was very useful. Another invention that people considered the most useful invention of science are antibiotics. Antibiotics help cure many illnesses.
The model T was one of the most useful inventions of all time. They were used for everything by everyone
Rhodium
Edward chidiac
the bulb
the answer is the wheel or as we call it the tire
stainless steel, stickgim,
Some of the most important inventions were made in the renaissance. The lens, telescope, alarm clock made ( don't worry, not digital :] ), also a flush toilet!! xD Hope i helped
Henry Ford had the most inventions
Personal computers Pocket calculators mobile phones satellite communication systems