A bird perched on a single wire has both feet at the same electrical potential. With no voltage difference between them, current has no reason to pass through its body and simply carries on through the metal. Danger comes when its wings touch a second wire or a grounded pole at the same time. Large birds of prey sadly fall victim to this.
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.