If you want to protect data in an Excel spreadsheet from prying eyes, set the color of the font to the color of the background. In this way you can be sure no one but you will know the data is there and be able to see it. This is especially good for super important confidential information like salaries, profit/loss numbers, etc which may be get lost permanently if using other protection schemes.
In order to view the data, highlight the cells with the secret confidential information and voila, it magically reappears.
Note: Unfortunately this is a true story. I’m not even going to say “believe it… or not…”
