Hi! This is my first post, and maybe there is already a thread about this, but I couldn't find one. I found this forum through StumbleUpon. My question is, what exactly is e? How did Mr. Euler get to this number? I am from germany and recently graduated in a "gymnasium". Somewhat like the american high school. So I used e before, and I get how it is used and what for. However I don't understand the thing itself. How he found it and what it really is... (other than "natural growth"). I really hope I get a conclusion out of this. I always found maths interesting and never had any problems in school. This is the only thing I just could never understand. Thank you for your attention!