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If you follow a hashtag, create a story on Twitter, want to save your own tweets, or host your own Twitter hashtag chat then you probably want to archive this information. Twitter’s policy is to get rid of tweets within 5 days time unless you favorite a tweet. You can try to favorite tweets but you are limited to 100. The following services will help you archive tweets and save tweets.

This 10-week course for non-science majors focuses on a single problem: assessing the risk of human-caused climate change. The story ranges from physics to chemistry, biology, geology, fluid mechanics, and quantum mechanics, to economics and social sciences. The class will consider evidence from the distant past and projections into the distant future, keeping the human time scale of the next several centuries as the bottom line. The lectures follow a textbook, "Global Warming, Understanding the Forecast," written for the course. For information about the textbook, interactive models, and more, visit: http://forecast.uchicago.edu/