Science explains when to visit the hospital, answer emails, and deliver bad news; Psychiatrist's new warning that Trump's mental state ‘is a national and international security risk; Tiny robots inserted in pigs are making tissue grow inside the body.

Air Date: Jan 13, 2018 12:00 AM ET

Why you shouldn’t make major decisions in the afternoon; Trump's mental state; Robotic implants help grow tissue inside living pigs; CRISPR genome editing; Ibuprofen pain killers mess with men's testosterone; Whose DNA is present in a donor heart?