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Timer Pop allows you to create and save multiple timer settings. For example, if I want to have a count down that lasts for five minutes, a count down of fifteen minutes, and a count down of three minutes I can save them all. Then when I need one of them I'll just click on it to start the count down.

"This is beautiful, powerful, intuitive math that lives in your browser. Graph multiple functions in vivid color and watch them update as you type. Save your work to the cloud or share it with friends."