Every rainbow color matches a single wavelength of light, from red to violet. Magenta has none: there's no such thing as a pure magenta wavelength. Your brain invents it when your red- and blue-sensitive cones fire together while the green ones stay quiet. That's how it bends a straight-line spectrum into a color wheel.
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.