"Every reel on a slot machine has a certain number of stops which contain either symbols or nothing. While machines with physical reels usually have 22 stops, virtual slot machines can have hundreds of stops."

"If you turn over a playing card, the chance it will be red is 0.5, or 50%. If the casino was fair, it would pay you $1 for a $1 bet. But if a casino pays you $0.90 instead, it has a 5% edge."

"The most confusing type of slot machine are the 'Buy-a-Pay' machines. On these, the payout for wins is based on how much you bet, where playing anything other than max coins doesn't make sense."

"1930s Montana saw a game similar to the 'Chinese Lottery' become popular as people could win a lot of money from a tiny bet. Eventually this game travelled to the legal gambling pastures of Nevada."

"Modern video keno can trace its roots all the way back to ancient China, where a lottery-style game called 'white dove' was used to finance the army during times of war and hardship."