Mesmerising charts show world's most and least populated countries over timeOlympic gold is great, but athletes say some cash to go with it is even betterNadal returns to action with easy win over Cobolli in first round of Barcelona OpenLottery, gambling bill heads to Alabama legislative conference committee for negotiationsBoston Marathon winners hope victories will earn them spot in Paris OlympicsPGA Tour gets postThe push for school choice in Nebraska is pitting lawmakers against their constituentsBuffalo Sabres fire head coach Don Granato after extending playoff drought to 13th seasonPGA Tour gets postVisa fees for international artists to tour in US shot up 250% in April