http://www.newsweek.com/elon-musk-birth-rate-concerns-resurface-amid-twins-report-grimes-shivon-zilis-1722563

Elon Musk once expressed concerns about the falling birth rate in the U.S.—before quipping that he was doing his part to boost the population.

The Tesla and SpaceX CEO's comments on the issue have resurfaced following a report by Business Insider that Musk quietly welcomed twins in November with Shivon Zilis, an executive at his artificial intelligence company Neuralink.