You've eaten so many eggs in your lifetime (around 279 a year, on average, according to the American Egg Board), you probably think you know all there is to know about eggs. But do you? There are some straightforward facts about eggs. For example, "They're very nutrient-rich in vitamin D, folate, vitamin B2, selenium, iron, vitamins A and E and other nutrients. There are 6 grams of protein in 1 large egg (that's a lot for just one little egg) and very little saturated fat (1.6 grams per egg). Eggs also help increase HDL,…