Coverage starts at 8pm on STV. People living outside Scotland can watch it live on the internet.
Some people have complained that the whole independence row is getting a tad repetitive. To spice things up, why not take a drink every time one of these phrases is mentioned during the course of the debate?
- President Obama unveiled a climate change plan on Monday that calls for federal limits on the amount of carbon power plants can produce.
- Puerto Rico has failed to make a $58 million debt payment, and credit rating agency Moody's says the U.S. territory is in default.
- The man accused of fatally shooting a Memphis, Tennessee, police officer on Saturday has turned himself in.