remembering

I thought I had forgotten my PIN number, and when I requested it from FAFSA, I didn't get it in the e-mail. But when I went to change my email address and had to submit my PIN, I put down what I vaguely thought was the number and it was the right one. Amazing how human memory can be, so uncertain as life, yet more capable than a computer--because computers, once you've put a magnet on it, put it in the freezer, or drop it accidentally, more often than not, that is irretrievable.

Unlike human beings, you must back up your hard disk drive. Human beings are irreplaceable: Hard disks must be replaced frequently.