I was fortunate to have as a kid the two best hobbies for learning about the world: Stamp Collecting and Shortwave Radio.
Yes, I did some stamp collecting and coin collecting too.
Two other hobbies which young people today just don’t seem to have much interest in.
I remember back in my day, you could still find Buffalo nickels and Mercury dimes in circulation, and you could find them in pocket change. It was possible to assemble a nice collection of the coins then. Not sure you could do the same today, in terms of collecting many years past of old coins today.