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Those little white strings, or chalazae, are what secure the yolk to the inside of the eggshell. They also indicate the age of the egg:

When a chalaza first starts to form, it appears as a thin straight line. As the egg moves around, the yolk forces the string to twist, being held in its twisted state by the weight of the yolk. As the egg ages, these twisted strings become increasingly more difficult to see. With a truly fresh egg, you may be lucky enough to even see multiple chalazae. However, these strings only denote the freshness of the egg, not the overall quality or how it was raised. It’s also important to look closely at the air cell between the egg shell and the egg membrane. The larger this air sack, the older the egg.

If you're wondering if it's safe to eat chalazae, then wonder no more! They may look funny but are absolutely harmless and typically don't affect the flavor of the food they're used in. Still, you can remove them if you prefer.

A common question regarding chalaza is whether or not you can eat the strings. It’s important to note that these strings are not harmful and are completely edible. In most dishes you’ll be unable to tell they are present, such as with scrambled eggs or baked products. However, many chefs choose to strain them out for certain applications where a smooth texture is crucial for their finished product, such as with custards.

We'd noticed those little white strings in our eggs, and kind of wondered what they were but never really thought too much about it. After all, a lot of foods look strange when you see them uncooked or up-close. We're really glad we too the time to learn about this strange feature of eggs, however, because it just makes us appreciate this incredible food even more!

Article Source: Positive Med