Jane Hart has a blog I like called E-Learning Pick of the Day. She just started a very interesting little service she calls 140 University which offers a variety of educational nuggets every day on a whole variety of topics. You might want to check out a few topics including Engineering, Technology, and History.
Basically, these nuggets are 140 character snippets that can be received either via Twitter or Facebook and contain a URL link that takes you to a webpage that expands on the nugget. You can also read them right on the home page at 140 University. For instance, the Engineering entry for January 19th was:
Isambard Kingdom Brunel, a British engineer, was the creator of the Great Western Railway and numerous bridges http://bit.ly/5ywEGfHer concept goes under the heading of "I Wish I Had Thought of That". Kudos to Jane.