I'm not sure how old you are but I remember using the internet back when they had BBS's.  I really enjoy what it has evolved into.  How about you?
I do not start to use the internet early but the fact that some interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide can send and receive information is a breakthrough. 
I agree - quite a break through for humans.  They finally had a spot to exchange information instantaneously.  It's interesting to think about days before it was widespread.  What did people do with their free time?
I love the working principle of  computer network. The use of  nodes to share resources.
Sharing resources is something that can be translated in many different forms.  This can include assembly lines all the way down to transistors.  It's crazy how different forms can inspire other forms. 
Hmmm. Do you know about transistors and semiconductor . I know so much about electronic signals and electrical power.
I don't know a lot but I do have a lot of respect for Nikola Tesla.  His knowledge has led us to many great inventions.
Oh yes, the  Serbian-American inventor was one of my role model in electrical engineer and mechanical engineer.