Răspuns:
1.
X-rays was discovered by mistake
In 1895, a German physicist named Wilhelm Roentgen was working with a cathode ray tube.
Despite the fact that the tube was covered, he saw that a nearby fluorescent screen would glow when the tube was on and the room was dark. The rays were somehow illuminating the screen.
Roentgen tried to block the rays, but most things that he placed in front of them didn't seem to make a difference.
When he placed his hand in front of the tube, he noticed he could see his bones in the image that was projected on the screen.
He replaced the tube with a photographic plate to capture the images, creating the first X-rays.
The technology was soon adopted by medical institutions and research departments - though unfortunately, it'd be some time before the risks of X-ray radiation were understood.
2.
Nikola Tesla
We owe much of our modern electrified life to the lab experiments of the Serbian-American engineer, born in 1856 in what’s now Croatia. His designs advanced alternating current at the start of the electric age and allowed utilities to send current over vast distances, powering American homes across the country. He developed the Tesla coil — a high-voltage transformer — and techniques to transmit power wirelessly. Cellphone makers (and others) are just now utilizing the potential of this idea.
