Mecum Auctions has been coming to Houston since 2012, and the sale has since become a fixture of the spring auction season.

Another quiz question on that enormous sum.

Berkshire, meanwhile, was sitting pretty on a 10% gain—and a pile of cash to make Scrooge McDuck blanch. Converted into $100 bills, its $334bn in liquid assets would fill 1,900 king-size mattresses.

It offers a high interest rate of 4.00% APY (Annual Percentage Yield) while still letting you withdraw money as frequently as you want without fees. Wealthfront isn't a bank, so it provides ...