How complex can the Internet be?

An important factor that adds to the complexity of the Internet is the ability of more than one computer to use the Internet through only one node, thus creating the possibility for a very deep and hierarchal sub-network that can theoretically be extended infinitely (disregarding the programmatic limitations of the IPv4 protocol). However, since principles of this architecture date back to the 1960s, it might not be a solution best suited to modern needs, and thus the possibility of developing alternative structures is currently being looked into.

According to a June 2007 article in Discover magazine, the combined weight of all the electrons moved within the Internet in a day is 0.2 millionths of an ounce.

Sources:
http://en.wikipedia.org/wiki/Internet
http://seattletimes.nwsource.com/html/businesstechnology/2003667811_btrebuildnet16.html
http://discovermagazine.com/2007/jun/how-much-does-the-internet-weigh/