Private-equity giant Carlyle bought a stake in a startup that uses AI to judge how much you smile in interviews, and now it's offering the tech for free to its portfolio companies

· As businesses shut down amid the coronavirus pandemic, a record number of Americans have been left jobless.
· Under shelter in place conditions, people are still looking for work and businesses are still looking to hire.
· Private equity giant The Carlyle Group bought a majority stake in HireVue last year, and it's...