Why is TV 29.97 Frames Per Second (in North America)?

Why is TV 29.97 Frames Per Second (in North America)?

Matt Parker explaines why the NTSC world got stuck using a frame rate of 29.97Hz instead of 3ohz. It was all due to the introduction of compatible colour and needing to avoid interference. The PAL system used outside of North America was based on a whole new 625-line...