You may have heard that antique windowpanes are thicker at the bottom because glass is a slow-moving liquid. It isn't: at room temperature glass is an amorphous solid, and a 1998 calculation found that visible flow would take far longer than the age of the universe. The real reason is craftsmanship: old panes were uneven, and glaziers often set the thick edge at the bottom.
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.