< br> In the experiment, he came across penicillin. This magical medicine has saved countless lives, which is the success he and several scientists have achieved with their efforts.
< br> Fleming won the Nobel Prize in Medicine. He said: "Opportunities are only reserved for prepared minds."
2, 1895 1 1 Friday, 8th of May, this afternoon, Roentgen was doing experiments in the laboratory as usual. He first wrapped a crookes discharge tube with black paper, blackened the room, connected the induction coil, and made the high-voltage discharge pass through the discharger. The black paper did not leak light, and everything was normal. He cut off the current and prepared to do the experiment every day, but in a blink of an eye, there seemed to be a flash of green fluorescence in front of him, and then it was dark. Just now, the discharge tube was wrapped in black paper, and the fluorescent screen was not erected. How can it be fluorescent? He thought he must have observed this mysterious fluorescent fire in the dark room all day, formed a habit and had an illusion, so he repeated the discharge experiment. But the mysterious fluorescence appeared again. With the ups and downs of the induction coil, suddenly a small pale green cloud floated in the depths of the night sky, moving evasively. Roentgen was shocked. He grabbed the match on the table and scratched it with a "cha". Originally, a small screen of platinum barium cyanide stood nearly one meter away from the workbench, and the fluorescence was emitted from here. But cathode rays must not pass through the air more than a few centimeters. How can they make this surface flash on the fluorescent screen nearly one meter away? Is it an undiscovered new ray? At this thought, he was thrilled. He was 50 years old this year. He worked in this dark room without winter, summer and night, struggling to explore the mysteries of nature, but he never saw a glimmer of light. Is this fluorescence a sign of the arrival of fate? He excitedly held up the fluorescent screen and moved the position in tandem, but the green light would never die. It seems that this new ray has a strong penetrating ability, which has little to do with distance. So can it penetrate other substances besides air? Roentgen pulls out a playing card to block the rays, and the light still appears on the screen. He changed another book. Although the screen is not as bright as it was just now, it still shines. He changed another thin aluminum sheet, and the effect was the same as that of a thick book. He replaced it with a thin piece of lead, but there was no light-lead could actually cut off the rays. Roentgen was so excited that he kept changing the shelter. He tried almost everything he could touch at hand. At this moment, the workmates came in to urge him to eat. He casually promised, but he didn't start. Although the experiment in his hand stopped, he was still staring at the screen. Now it is certain that this is a new kind of ray, but what is its use? What shall we call it for the time being? It's really an unknown number. Well, let's call it "X-ray" for the time being.
There are many examples ..