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频道帖子
“The trick to having good ideas is not to sit around in glorious isolation and try to think big thoughts. The trick is to get more parts on the table.”
- Steven Johnson
| 2 |  +1Craters at the Moon’s south pole may be the frostiest locale in the entire solar system. In the permanently shadowed crater floors, “daytime” temperatures may never rise above minus 238 degrees Celsius (minus 397 degrees Fahrenheit). | 731 |
| 3 | Greatest rocket scientists of all time:
1. Konstantin Tsiolkovsky (1857-1935). Konstantin Eduardovich Tsiolkovsky was a Russian and Soviet rocket scientist who pioneered astronautic theory.
2. Theodore von Karman (1881-1963). Most people know Theodore von Karman for his work on hypersonic and supersonic technologies in aerodynamics. Aside from being an amazing teacher, Theodore von Karman also worked hard to advance the field of aeronautics. He created mathematical models to determine how air flows around an object when it moves through space.
3. Robert H. Goddard (1882-1945). Robert Hutchings Goddard was an American engineer, professor, physicist, and inventor who is credited with creating and building the world's first liquid-fueled rocket.
4. Friedrich Zander (1887-1933). Georg Arthur Constantin Friedrich Zander, was a Baltic German pioneer of rocketry and spaceflight in the Russian Empire and the Soviet Union. He designed the first liquid-fueled rocket to be launched in the Soviet Union, GIRD-X, and made many important theoretical contributions to the road to space.
5. Sergei Korolev (1907-1966). Sergei Pavlovich Korolev was a lead Soviet rocket engineer and spacecraft designer during the Space Race between the United States and the Soviet Union in the 1950s and 1960s. He is regarded by many as the father of practical astronautics.
6. Valentin Glushko (1908-1989). Valentin Petrovich Glushko was a Soviet engineer and the main designer of rocket engines in the Soviet space program during the heights of the Space Race between United States and the Soviet Union.
7. Paul Ehmayr (1909-1993). Paul Ehmayr was an Austrian-born rocket scientist who specialized in precision mechanics. He contributed to the development of liquid-gas-powered rockets, which enabled rockets to be used as weapons.
8. Wernher von Braun (1912-1977). Wernher Magnus Maximilian Freiherr von Braun was a German-American aerospace engineer and space architect. He was a member of the Nazi Party and Allgemeine SS, as well as the leading figure in the development of rocket technology in Nazi Germany and later a pioneer of rocket and space technology in the United States.
9. Frank Malina (1912-1981). Frank Malina, an American aeronautical engineer, is best known for making the first research rocket that went to space.
10. Jack Parsons (1914-1952). Jack Parsons was an American rocket engineer who is best known for his work with the Jet Propulsion Laboratory. He made many contributions to the field of rocket science and engineering.
11. Mary Sherman Morgan (1921-2004). Mary Sherman Morgan was a U.S. rocket fuel scientist credited with the invention of the liquid fuel Hydyne in 1957, which powered the Jupiter-C rocket that boosted the United States' first satellite, Explorer 1. | 799 |
| 4 | If you divide 1 by 998,001, the resulting decimal number will give you almost every three digit number.
For example, the decimal starts as follows:
0.000001002003004005006... and so on.
Almost, because one three digit number gets skipped: 998. | 741 |
| 5 | On March 22, 1887, Nikola Tesla patented Dynamo electric machine. | 875 |
| 6 |  https://www.amazon.com/dp/B09QGJDH9K/ref=cm_sw_r_as_gl_api_gl_i_Y8N4R77JKS93RH7T76H3?linkCode=ml1&tag=woe0f-20 | 828 |
| 7 | 没有文字... | 839 |
| 8 | |🙂| = 🙂
|☹️| = 🙂 | 837 |
| 9 | You are good enough.
(Actually, you’re probably overqualified but let’s start the week off humble.) | 1 056 |
| 10 | Cleopatra lived closer in time to the Moon landing than to the construction of the Great Pyramid of Giza. | 1 114 |
| 11 | On Mar 5, 1981 – The ZX81, a pioneering British home computer, is launched by Sinclair Research and would go on to sell over 1.5 million units around the world. | 1 164 |
| 12 | Bill Gates was so addicted to Minesweeper, he used to sneak into then - Microsoft President Michael Hallman's office after work to play it, as he had uninstalled the game from his computer. | 1 145 |
| 13 | How to test batteries without a multimeter:🪫 vs 🔋
https://youtube.com/shorts/fedkoIyEAYY?feature=share | 780 |
| 14 | Beer is active power (kW) - the useful power, or the energy that is doing work.
Foam is reactive power (kVAR) - wasted power or lost power. It’s the energy being produced that isn't doing any work.
The mug is apparent power (kVA) - or the power being delivered by the utility. | 855 |
| 15 | 🫱🏻🫲🏿 | 829 |
| 16 | Physics exam question. | 887 |
| 17 | Slow motion test with $500 compact camera (250, 500, and 1000 fps):
https://youtu.be/-r0Hcija8Ls | 707 |
| 18 | Physics and mathematics. Best math meme ever. 😎 | 1 337 |
| 19 | Which of these trucks are driving? | 882 |
| 20 | The fifth hyperfactorial: 5⁵ × 4⁴ × 3³ × 2² × 1¹ = 86400000 milliseconds. And it is exactly 1 day! | 784 |
