Concerns about property developer China Evergrande Group had investors going early in the week of September 20. Dow futures were off by nearly 500 points, when Fortune took a pulse on Monday. They'd ultimately drop by more than 664 points, as the site DowFutures.org's historical graph noted.

A look at the same Dow futures history graph showed that by Tuesday, roughly two-thirds of the drop had come back. So, maybe not the next Lehman Brothers, as some opined?

"With more than $300 billion in liabilities and only $15 billion in cash on hand, Evergrande is currently the world's most indebted real estate developer," wrote Ryan Detrick, chief market strategist for LPL Financial. "Worries are mounting that starting next week it won't be able to pay $84 billion of interest due (according to Bloomberg), along with potentially missing a principal payment on at least one of its loans."