— A Fed official wants to stop paying banks to hoard money.

— France's tax on financial non-transactions.

— A man orders a television off of Amazon. Amazon delivers a semi-automatic rifle instead. Confusion ensues.

— MIT students earn $8 million hacking the lottery.

— How an EPA plan to get lead out of the water backfired.

— An investigation into the rise of high-speed trading on Wall Street.

— The true cost of producing an Olympian: "At best, say athletes and others connected to the Olympics, it’s easily a six-figure 'investment' – with no guarantee of a 'return' (meaning a medal or an endorsement deal) – when factoring in the costs of equipment, coaching and travel."