Salesforce to buy work chat service Slack for $27.7 billion

Two San Francisco tech giants headquartered about a block away from each other are joining forces. Cloud software pioneer is buying work-chatting service Slack for $27.7 billion in the biggest acquisition of Salesforce's 21-year history.

US panel to decide who should get the first COVID-19 shots

An influential government advisory panel convened on Tuesday to answer one of the most pressing questions in the U.S. coronavirus outbreak: Who should be at the front of the line when the first vaccine shots become available?