Researchers released a nutritional index this week aiming to inform guidelines and help Americans achieve healthier and more environmentally stable diets. The index ranked foods by minutes gained or lost off healthy life per serving, with processed meats and sugary drinks among the biggest offenders. Findings included over 5,000 foods in the U.S. diet classified by health burden and environmental impacts. “We use the results to inform marginal dietary substitutions, which are realistic and feasible,” authors wrote. “We find that small, targeted, food-level substitutions can achieve compelling nutritional benefits and environmental impact reductions.” The foods studied ranged from 74 minutes…

Jack Dorsey is one of Silicon Valley's eccentrics. If he was a character in a movie, you'd think he was too cliche. Acutely earnest and idealistic, he passionately believes that tech can bring about global peace and prosperity. He's a kind of hippie libertarian, a philosophy that seems somewhat baffling at times. He also happens to be a genuine tech visionary. His resignation from Twitter is the second time he's left. After leaving the social media giant that he co-founded the first time, he setup the digital payments company Square in 2009 - which has become wildly successful. He came…