What inventions and improvements have emerged during the second world war?

Question

What inventions and improvements have emerged during the second world war?

Answer 1

Radar, sonar, jets, and rockets all made big advances.

Nuclear bomb.

Computers really came along--mostly for cryptography.

Answer 2

In addition, there were advances in medicine. Penicillin came into more common use and surgical techniques developed in battle zones have come into usage on civilians.

FM radio was more developed and of course Television. The computer was mostly in theory. The Germans had mechanical ones used for codes.