Everyone should take a few minutes (meaning a few hours once you get sucked in) and take a look at Quora. The concept of the site is to use crowdsourcing for answers to questions. Questions are asked of the community. People choose to answer. For example, someone asked: “Why did people wear more hats in the past?” Top answer at the moment is “Prettier hair correlates with the decline in use of hats.”
Depending on the quality of the people following the topic, a great, okay, or poor answer will be given.
Another good Quora question: “What are some systems we live with today that were designed for a world of the past?“