Discover practical calculations that do not fit neatly into the other collections.
How to calculate movie end time
Add a movie runtime to its start time, account for trailers, and handle a finish after midnight. A clock and elapsed-time ribbon make each step visible.
Foot length and shoe size: how the conversion works
Measure heel-to-toe foot length and see what a simplified shoe-size formula can—and cannot—tell you. The animation explains unit conversion, sizing offsets and brand-specific fit.