Still, an average of 20% of all customers buy optional insurance from the rental company every time they drive a rental.

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SocialPsych encourages students to take optional multiple-choice quizzes during their free time to earn badges certifying mastery of a subject.

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Now is a really bad time to decide that reality is optional.

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The detachable unit consists of a 3.5-inch LCD which gets its navigation information from an SD card, and if you opt for TomTom's optional service package it'll provide real time traffic info as well.

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That chip, along with the custom charging circuitry developed by OLPC and Marvell means that the tablet can be charged by a hand crank at a 10:1 ratio (10 minutes of usage time for every minute spent cranking), or by the optional four watt solar panel cover at a 2:1 ratio on sunny days.

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The 48-game schedule is filled with back-to-backs, which leave no time to practice, or short turnarounds that cause coaches to hold optional skates instead of full practices to make sure their players are rested.

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The optional dock offers the same features it always has, but for any first-time Transformer buyers who might be reading this, here's a quick primer: in addition to being an external keyboard, the dock is home to an SD card slot, a full-size USB 2.0 port and a built-in 19.5Wh battery, allowing you to go longer without charging your tablet.

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