Quick Tip: Getting Rid of Headers When Printing Worksheets
There's obviously a whole lot of worksheet printing going on around Dad's office, not to mention a fair bit of other web-based material going straight from the browser to printed page. By default, your browser will print a timestamp, page numbers, URLs and potentially other stuff in the header or footer of the page. You can disable this, but the instructions vary depending on your browser and OS.
Thankfully, LifeHacker has a nice guide to freeing up a little extra room on the printed page to get some cleaner output...