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What is a tax ID number and how is it used?

What is a tax ID number? It's a unique nine-digit number issued by the Social Security Administration or the IRS to anyone ...
Forbes

The 10-Digit ISBN Is Getting Retired Next Year

Every commercially published book in the world is given a unique International Standard Book Number, or ISBN. On its inception in 1967, that number was 10 digits long, though it was updated to 13 ...