In Brief Amazon has shut down a four-year-old secret program working on a fertility monitoring device and accompanying smartphone app, CNBC reported.The project, which was known by the codename “Encore,” evolved out of Amazon’s 2020 purchase of a startup called bluDiagnostics, which was developing a device that measured the levels of estradiol and progesterone — two of the hormones responsible for fertility in women — from saliva samples. Amazon planned to release the product this year, but the team of app ...