Search giant is amassing health records from Ascension facilities in 21 states; patients not yet informed Google is engaged with one of the country’s largest health-care systems to collect and crunch the detailed personal health information of millions of Americans across 21 states.The initiative, code-named “Project Nightingale,†appears to be the largest in a series of efforts by Silicon Valley giants to gain access to personal health data and establish a toehold in the massive health-care industry. Amazon.com Inc., Apple Inc. and Microsoft Corp. are also aggressively pushing into health care, though they haven’t yet struck deals of this scope.Google began the effort in secret last year with...