At 0.01 °C and a pressure of about 611 pascals, just 0.6% of atmospheric pressure, water reaches its triple point. Ice, liquid and vapour all coexist in balance. In a chamber pumped free of air, you can watch water bubble while ice crystals form on its surface. This point was so reproducible that it long served to define the kelvin.
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.