Visible light spans wavelengths from about 400 to 700 nanometres, so the longest is not even twice the shortest. In music, that would be less than an octave. Radio waves, microwaves, infrared, ultraviolet, X-rays and gamma rays are all the same stuff: you perceive only a tiny window of the spectrum.
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.