The compass was invented during the Han dynasty in China.
Johannes Gutenberg perfected the printing press and began using it commercially in 1450.
The microscope is most credited to Hans and Zacharias Janssen.
Rene Laennec created the stethoscope to improve on auscultation.
The typewriter was invented by American William Burt.
Controversy exists over whether or not Alexander Graham Bell was the true inventor of the telephone, though he did patent it in 1876.
Edison innovated the light bulb, creating what we use today.
The X-Ray was discovered by William Roentgen in 1895.
Antibiotics were invented by Alexander Fleming, a Scottish physician.
They are large radio receivers and antennae used to pick up waves from celestial sources.