"Once upon a time... DNA" - The basics of classical and molecular genetics
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Publish at December 17 2025 Updated December 18 2025
A family behind the map of France
The legacy of 4 generations
While today's world is easily mapped thanks to satellite technology, it was a long and arduous task to draw up the first geographical maps. The first map to cover the whole of France was the Cassini map. If we were more precise, we'd say the Cassini, as it took four generations of the same family to complete.
It all began in 1745, when Jacques Cassini was asked by Louis XV to produce a truly comprehensive map of the country. He began by following in the footsteps of his father, a brilliant Italian astronomer.
At the time, the sky served as a "compass" for cartographers. He carried out a series of highly precise triangulations, which his son and grandson continued for 70 years. They had to build platforms to record every river, forest, tower, castle, etc. A work of goldsmith's art which, unfortunately, soon became obsolete, given the time taken to produce it. Nevertheless, this map lives on today in the French geoportail.
Running time: 4 minutes
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