This is a personal anecdote from my college days in India (~early 90s). Our college had a mini computer/timesharing system and a separate PC network in our Comp

This is a personal anecdote from my college days in India (~early 90s). Our college had a mini computer/timesharing system and a separate PC network in our Computer Engineering lab. Those days we could enter the lab only after removing our shoes outside the lab (socks ok), presumably to avoid the dust from the shoes.