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Find all the latest ProFootballTalk news, live coverage, videos, highlights, stats, predictions, and results right here on NBC Sports.

Excel and Google Sheets have three functions to calculate the internal rate of return: IRR, XIRR, and MIRR. Learn how these functions can calculate investment returns.

Pro rata is a term used to describe a proportionate allocation. It's a method of assigning an amount to a fraction according to its share of the whole.

Spoon-shaped nails and a swollen, smooth tongue are unusual signs of iron deficiency. Learn more about the other odd signs of low iron levels.