Every year we make a donation to Wikimedia Foundation. We use Wikipedia almost daily around here. It holds information on almost anything and everything in the world. When you combine that with its other wiki based sites you really have the most up to date encyclopedia of world knowledge. We pretty much consider this a discount to the old Encyclopedia books every classroom or household had when we were kids! If you are interested go to https://donate.wikimedia.org to learn more about how you can support Wikimedia Foundation.