Alex Cohen is the Director of Learning and Evaluation for the Richard M. Fairbanks Foundation. High-performing school leaders have a substantial impact on student achievement. Studies that aim to isolate the impact of leaders on student test scores find that moving from a low- to a high-quality principal can mean several additional months of learning. […]

Reducing the amount of nicotine in cigarettes may lead some current smokers to smoke more – at least in the short term. But there’s also evidence that reducing nicotine in cigarettes can help reduce smoking.