text: about the brain....? is there a capacity for how much information your brain can hold?  for example, if i am a biology student, is there a limit to how much biology knowledge i can hold until i have to start forgetting old information to let new information in? the average brain can calculate 100 million mips (million computer instructions per second )  also, scientists have calculated that while even the biggest computer has a capacity of around 10,000,000,000,000 bytes (10 to the power of 12), the human brain has a colossal 10 followed by 8,432 noughts, say the scientists who made the calculations in the journal brain and mind.  so basically, you are pretty darn smart.