Computers typically make use of a "central processing unit," or CPU. After careful self-analysis during today's drive, I've realized that I make use of an "Ian processing unit," or IPU. Much like a CPU, the IPU can perform a lot of work so as long as the activity remains below a maximum threshold level.
Herewith an illustrative example: The IPU might be busy with two tasks. First, the IPU might trying to maintain a comfortable speed of 80 miles-per-hour on Interstate 90 westbound while trying not to get blown off the road due to disturbingly-high winds. Second, the IPU might be listening to the eleventh chapter of Bram Stoker's
(Emily's Corolla gets 30-35 miles after the fuel gauge lights up, so we were more than fine. Here's where you get to imagine nervous chuckling.)