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★★★★★
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Saved lessons. Tap the bookmark on any lesson to keep it. Everything you've saved now lives on a Saved page, one tap from Today. And since every lesson comes in three depths, the Saved page carries the same High School / College / PhD switch. Save something at College, come back to the PhD version of it later your saved list stays put whichever level you're on.
Most facts go in one ear and out the other. Field Guide is built so they don't. Each lesson takes two or three minutes and follows a simple loop proven to build memory: you predict an answer first, you get taught one clear idea, then you're quizzed on it. Guessing before you learn is the trick that makes it stick. Then spaced review brings each lesson back days later, right before you'd forget, so it moves into long-term memory instead of fading by tomorrow. WHAT'S INSIDE Hundreds of lessons across science, history, money, health, art, engineering and more A predict → teach → check loop that's actually fun Spaced review that schedules itself A streak to keep you honest Clean, calm, no-fluff design. No ads, no clutter. Browse by subject, get a fresh lesson each day, or hit Random and learn something new right now. Field Guide works fully offline, and new lessons arrive automatically.