Ripples spreading across a calm lake after raindrops fall—and the way ripples from different drops overlap and travel outward ...

Learn the difference between Excel COUNT and COUNTA, plus TEXTBEFORE and TEXTAFTER tricks, so you clean text and totals with confidence.

Learn Google Antigravity with a beginner buildso you gain fast, hands-on app experience. Guiding the AI while you keep control and ship your first app.