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5 articles · All tags

• The Suez Canal: Why It Was Built and How It Works
  The Suez Canal is a sea-level waterway through Egypt that links the Mediterranean and Red Seas, opened in 1869 so ships could avoid the long voyage around Africa.
• Viking Longships: How They Were Built and Sailed
  Viking longships were long, shallow ships driven by oars and one square sail, which carried Norse crews from Scandinavia to Iceland, Greenland and North America.
• How GPS Works
  How a receiver on Earth calculates position from satellite signals — trilateration, atomic clocks, and the relativistic corrections that keep the system honest.
• The Gyroscope
  Why a spinning wheel resists being turned — angular momentum, precession, and the sensors that guide everything from bicycles to spacecraft.
• Reading Topographic Maps and Using a Compass
  How contour lines encode terrain, how to orient a map, take a bearing, and find your position — the durable skill set behind every navigation app.