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Have you ever wanted your Earth science students to have a controlled, concrete experience to learn about earthquakes? SeisMac, a free Mac OS X application, can help students develop a concrete foundation for learning about earthquakes. SeisMac turns a MacBook or MacBook Pro laptop computer into a seismograph without any additional peripherals. This application of accelerometers in the Earth science classroom can be extended beyond the Mac audience through the substitution of commercially available probeware systems that offer three-component accelerometers.