You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
100 brown-eyed and 100 blue-eyed perfect logicians live on an island, but none knows the color of their own eyes. There are no mirrors on the island, and communicating is forbidden. If any of them works out the color of their eyes, they must leave the island in the night.
Here's a more fully specified version of the riddle:https://www.popularmechanics.com/science/math/a26557/riddle-of-the-week-27-blue-eyed-islanders/ …
