Let’s draw Feynman diagrams! (Part 1 of 20) You do not need to know any fancy-schmancy math or physics to do this! That’s right. I know a lot of people are intimidated by physics: don’t be! Today there will be no equations, just non-threatening squiggly lines. Even school children can learn how to draw Feynman diagrams (and, I hope, some cool science). Particle physics: fun for the whole family.
Previously on MetaFilter, we discussed a strange new form of propulsion that NASA was investigating. There are variants to the EM Drive, but the basic principle is the same: put lots of microwaves into the right shaped chamber, and thrust appears. Electricity to motion in free space? Much skepticism. But nearly a year and much more testing later - the story is getting weirder.
Richard Feynman delivers a charming talk about Quantum Mechanics and Quantum Electrodynamics and the versatile, enigmatic photon. (SLYT - 1:17:58)
Capturing light in motion at a trillionth of a second. MIT, using a new technique called Femto Photography, consisting of femtosecond laser illumination, picosecond-accurate detectors and mathematical reconstruction techniques, has captured the movement of pulses of light.
Sorry Marty.. but 2.21 gigawatts ain't gonna cut it. Scientists have proven nothing can travel faster than the speed of light, so no time travelling for you, bub. A new study published in the American Physical Society's Physical Review Letters journal concludes that even single photons have to obey the posted speed limits. [more inside]
Physicists have managed to observe light behaving both as a particle and wave in the same double-slit experimental condition, by means of a new method to weakly observe a particle's momentum. This article in Nature summarizes the results in non-mathematical terms. [more inside]
Whether Einstein's "spooky science" or quantum weirdness, the Geneva tests that show entangled photons traveling at 10,000 times the speed of light are stirring up challenges and "Alice in Wonderland" discussions about "subatomic particles communicating nearly instantaneously at a distance." [more inside]