“Building these maps takes a very very long time using a combination of CNC and Laser equipment with traditional woodworking tools. It’s taken me years to perfect the process but it’s certainly a labor of love and well worth the effort.”
“Global Positioning System is, without a doubt, one of the most useful inventions of the late 20th century. It made it significantly easier for ships, airplanes, cars, and hikers to figure out where they are with high degree of accuracy.”
This is an excellent tiny whitepaper on how GPS works including several interactive little exercises that show how the satellite communications setup can accurately triangulate your position.
You’re presented with two cards representing two events from Wikipedia. Drag the one from the center to the correct sequence – before or after – the card on the bottom. If you guess right, the bottom of the card turns green and you get a new card. Repeat.