It was on a Thursday, this December 22nd, when Janssen’s story opened like a Hollywood thriller. France was in the grips of the Franco-Prussian War and our hero made a harrowing escape from a German siege of Paris. But in 1870...how do you get away that fast? You take to the air, and he did, by flying in a hot air balloon to Algeria in an attempt to study a solar eclipse. Enter HELIUM!!
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