Below about −271 °C, liquid helium becomes a superfluid that flows with zero viscosity. It then forms an ultra-thin film that creeps up the walls of its container, over the rim and drips out the other side. It also seeps through pores so fine that no ordinary liquid could pass. This is quantum physics you can see with your own eyes.
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.