How long a transfer really takes, and what upload speed a video call actually needs.
See whether a site actually has a working favicon, and what format the icon really is.
Render your link the way a chat app or X will show it, and generate the meta tags to match.
Drag out a grid definition and get the CSS with media queries attached.
Search and copy emoji by name, with skin-tone and category filters.
Simpson's rule, trapezoid and midpoint on any function, with the error estimate.
Runge-Kutta 4 and Euler on a differential equation, with a step-size comparison.
Daily calories from age, weight, activity and goal, using the Mifflin-St Jeor equation.
