THE UPS AND DOWNS OF YO-YOS

When I was a kid, I used to play a lot with yo-yos but the thing is that I didn't know that yo-yos was neither so remarkable in certain time nor where it came from. I considered yo-yos as one more toy. I didn't know that King Louis XVII played with a yo-yo, that it was used by adults to relieve tension and that Napoleon and his officers relaxed with their yo-yos before they get  into the war. It's owesome! because I played with yo-yo all the time during my childhood but I  knew nothing about all this information concerning yo-yos.