Even though Alana Bernstein of Manhasset is a 17-year-old high school senior, this spring she had to learn the alphabet all over again. Bernstein signed up for a new, free Zoom course in Morse code ...

Conventional wisdom holds that the best way to learn a new language is immersion: just throw someone into a situation where they have no choice, and they’ll learn by context. Militaries use immersion ...