'The Smartest Guys in the Room' is the byline of a 2005 documentary film about the collapse about what American company after it became embroiled in one of the biggest insider trading corporate scandals of all time?

Oil is measured in barrels, which is equal to 42 US gallons or 159 liters.

Venezuela leads the world with 300.9 billion barrels of oil reserves – a 17.8 per cent share of global reserves.