How did they invent the metre?

Have you ever wondered why a metre is exactly that long? Imagine trying to build a treehouse with your friends, but everyone's ruler is a completely different size! That is exactly what life was like in France in the 1780s. A foot or a pound changed from town to town, making building and trading a total chaotic mess! To fix this, two brilliant astronomers, Jean-Baptiste Delambre and Pierre Méchain, set out on a wild seven-year adventure in 1792. Their mission? To create a brand new measurement that belonged to everyone. They decided a "metre" would be exactly one ten-millionth of the distance from the North Pole to the Equator. But they didn't just do math at a desk—they climbed giant church towers and freezing mountain peaks with heavy brass telescopes! They even had to dodge angry mobs during the French Revolution because people thought they were spies! Join Mira and Finn as we uncover how these scientists dragged their telescopes across countries to create the world's very first metre. You will even discover the mind-bending secret of how we measure the metre today using the speed of light!