A former Pentagon official who helped establish United States policy on such weapons says they could be uncontrollable in real-world situations.

An official statement said the property tycoon Ren Zhiqiang had exerted a “vile” influence by spreading illegal information on the Sina Weibo platform.

Mr. Clark’s designs built a bridge from the era of mainframe systems that were programmed with stacks of punch cards to personal computers that respond interactively to a user.

An entrepreneur tries to start a company and raise venture capital in Silicon Valley — and then finds out she is pregnant.

The Apple-F.B.I. fray, in a terrorism case no less, is reverberating throughout the digital world, with some East Coast-West Coast divergences.