Social media apps regularly present teens with algorithmically selected content often described as “for you,” suggesting, by implication, that the curated content is not just “for you” but also “about you” — a mirror reflecting important signals about the person you are.

“Pat the Bunny,” the 1940 classic touch-and-feel book, is still in print — a testament to the value of touch in introducing infants and toddlers to the world of reading. Later, when children reach school age, a common technique for teaching the alphabet is using hands-on manipulation, such as forming letters out of clay.

Electric power generation in the U.S. is shifting rapidly away from fossil fuels toward cleaner and lower-carbon sources. State clean energy targets and dramatic declines in the cost of renewable electricity are the most important reasons.

The future of automobiles is electric, but many people worry about the safety of today’s electric vehicles. Public opinion about their crash safety often hinges on a few high-profile fire incidents. Those safety concerns are arguably misplaced, and the actual safety of these vehicles is more nuanced.