America's national debt has just ballooned to an eye-watering $22 trillion (£17tn) in 2019 – the highest it has ever been – so taxpayers' money should be spent wisely, you might think. However, there have been many cases, in which the government got it totally wrong, throwing away millions of peoples' hard-earned cash. From ridiculous studies in space to cancelled military projects that went massively over budget, here we take a look at some of the biggest wastes of money.