Einstein found entanglement so suspicious that he called it "spooky action at a distance." In 1964, John Bell devised a test to settle the matter. Experiments by Alain Aspect, John Clauser and Anton Zeilinger showed that nature really does violate Bell's inequalities, ruling out "local" hidden-variable explanations. Their work won the 2022 Nobel Prize in Physics.
Cooled below −183 °C, oxygen turns into a pale blue liquid. Pour it between the poles of a strong magnet and, instead of flowing away, it hangs suspended between them. The reason lies in its unpaired electrons, which respond to the magnetic field. Liquid nitrogen, by contrast, is colourless and pours straight through.
In 2012, Felix Baumgartner jumped from a capsule hanging beneath a balloon, about 39 kilometres up. In that extremely thin air almost nothing slowed him down, and he reached around 1,358 km/h in free fall, or Mach 1.25. He became the first person to exceed the speed of sound with nothing but his own body.