Facebook CEO and Harvard dropout Mark Zuckerberg, center, smiles as he is introduced before being presented with an honorary Doctor of Laws degree as Baylor College of Medicine professor Huda Zoghbi, left, and actor James Earl Jones, second from left, applaud during Harvard University commencement exercises, Thursday, May 25, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)
This handout photo provided by the Baylor College of Medicine, taken May 20, 2014, shows Dr. Kjersti Aagaard in her laboratory at the Baylor College of Medicine in Houston. Aagaard’s new research shows a small but diverse community of bacteria lives in the placentas of healthy pregnant women, and hints that the microbes may play a role in premature birth. (AP Photo/Agapito Sanchez, Baylor College of Medicine)