Melissa Nobles has been named as MIT's next chancellor, a senior academic post overseeing student life at the Institute. A political scientist, Nobles has served since 2015 as dean of the School of Humanities, Arts, and Social Sciences.

“The heart has very limited ability to repair itself in response to injury, disease, or aging,” Laurie Boyer says. She’s studying why humans — unlike certain types of amphibians and fish — cannot regenerate and heal their hearts after an injury.

Quinnton Harris ’11 told Fast Company about his push to make Juneteenth a paid holiday. “There are so many times in my life that I haven’t felt American,” he said. “When I learned that Juneteenth was a celebration of Black liberation, it felt so right.”

If vaccinated and unvaccinated people gather unmasked, who’s at risk? “As a fully vaccinated person, you are very well protected,” MIT Medical advises, adding: “Unfortunately, if you’re not fully vaccinated, there’s not much you can do ‘safely.’”

Kate Darling, a research specialist at the MIT Media Lab, spoke on Science Friday about “the historical lessons of our relationships with animals, and how they could inform our legal, ethical, and even emotional choices about robots and AI.”

Social media business models are under pressure from Congress and consumers. MIT Sloan’s Sinan Aral, host of the recent Social Media Summit @ MIT, and others say that subscription models, identity verification, and new regulation could help.