This update makes learning steadier and more honest. • An article with a check counts as done once you answer it, and a wrong answer now shows the right one and names the mistake • Items can carry several checks, so each idea gets more than one test • Bookmark single articles, problems and resources, and find them in Bookmarks • Lectures remember where you stopped • Articles and figures you have opened stay readable offline after content updates • Sign out of every device from Account, and deleting your account now asks for a fresh email code • A switch on Account to stop sharing usage and crash reports • Larger tap targets, selectable reading text, and charts that respect reduced motion

Cohort lecture videos are here. Watch the full course lectures inside the app, with a real player: scrub to any point, see the elapsed and total time, and go fullscreen. Wide formulas now scroll cleanly instead of running off the edge. Plus a long list of reliability fixes: sync status reports itself accurately, your activity refreshes when you come back to the app, the share sheet anchors correctly on iPad, and error reports are scrubbed of personal details before they are sent.

Reading - An expanded view that uses the full width of a laptop screen, with figures that grow to match. - Your place is kept when the column width changes. - Long formulas wrap instead of running off the line. - Every figure is drawn in ink you can see, in both the light and the dark theme. - The 3D surfaces are lit and shaded so they read as solid. Coming back - Save a module and pick it up from your saved list. - Resume where you stopped reading on this device. Account and devices - Try again now repeats the step that failed, not the step the form is on. - The device list says plainly whether a sign-out happened. - Your membership shows the date you have paid through. Under the hood - Smoother frames on the welcome and quiz screens. - Progress sync no longer stalls on a key the server refused. - Fixes to mastery, telemetry and quiz recording.