The Book with the most meaningful Impact on my Life (opens in new tab)

I was recently asked which book had the most meaningful impact on me. I had to think about it for quite a while and went through various books in my mind. But then it hit me like a bolt of lightning, and the answer actually sounds like a joke: It was the mail-order catalog from Conrad Electronic (No advertising - I don't get any money from this company; it's just a factual account). Conrad is a German mail-order company for electronic components and more, founded back in 1923.