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"Have you ever wondered just how loud a noise is? During a recent review of the SoundJaw iPad accessory, I needed to see if it really increased the volume of the iPad's speaker. What did I use to measure the sound level for the review? The iPhone version of Decibel Meter Pro (US$0.99, universal), a fun -- and useful -- app to measure the max, peak, and average dB (decibel) levels associated with a sound source."

"I'm in Minecraft, of course-the phenomenally popular, open-ended game that places players in a world in which they can live and build things infinitely. Marcus "Notch" Persson, the Swedish creator of Minecraft, started out by creating a simple game, allowing players to construct whatever they wanted, using a few different colored blocks, each equivalent to one cubic meter. Released in 2009, it has evolved into a massive, world-building video game in which players uses those blocks to create anything they can think of, from houses, caves, and machines to a scale version of the Death Star. Microsoft purchased Minecraft from Notch and his team for $2.5 billion in November 2014. There aren't any express objectives or any real way to win in Minecraft. It's a "sandbox," in gaming speak-offering free play without a specific goal and currently used by more than 18.5 million players, with some 20,000 more signing up every day. Users may choose between Creative Mode, in which they can build using unlimited resources by themselves or with friends, with no real danger or enemies, and Survival Mode, where they fend off enemies and other players and fight for resources and space. They can trade items and communicate using a chat bar. Modifications (or mods) can add complexity by creating things like economic systems that let players buy and sell resources from in-game characters using an in-game currency system. These downloadable mods can also add computer science concepts and thousands of additional features."

"Calvin and Hobbes had millions of followers when it was retired in 1995 after a 10-year run"