Bored on a summer day? Tired of self-directed, specific-goal web learning and surfing?
Want to just explore and surf around materials that is socially interesting, relevant to you, and that could lead anywhere?
Go to Wikipedia and use the search field in the upper right to search for a year in history.
How about a little nostalgia? Search the year you graduated from high school.
Wondering about a little pre-you history that set the stage? Search for 10 years before you were born.