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A map projection is the math that turns the round Earth into a flat picture. Every projection lies about something. The complete guide — what each one preserves, what it distorts, and which to use when, with 6 projections rendered side-by-side from identical source data.

Africa is 14× larger than Greenland — but on every Mercator map (school walls, atlases, Google Maps until 2018) they look about the same size. The math behind one of the most consequential visual lies in geography, with side-by-side Mercator vs Equal-Earth maps.

From real-estate school searches and HVAC service areas to drone flight ranges and hurricane cones — 25 concrete ways a radius map earns its keep, each with a named city, a workflow, and a one-click prefilled example.

The United States has 3,143 counties and county-equivalents across 50 states plus DC. Texas leads with 254 counties while Delaware has just 3.

California leads at 39.3 million residents while Wyoming is the smallest at 576,000. Complete ranked list of all 50 states plus DC.

San Bernardino County, California covers 20,057 square miles — larger than 9 US states. Explore the biggest counties in America.

Your county matters for taxes, voting, and jury duty. Here are 5 easy ways to find which county you live in, including a free GPS-based tool.

Google Maps doesn't have a built-in radius tool. Here's a free alternative that lets you draw circles, measure areas, and find what's within range.