• Potassium Hydroxide
  A battery works by converting chemical energy into free electrons; some of the electrons get used, and the rest return to the cell. The battery needs a way to move the current internally. Enter potassium hydroxide, an alkaline electrolyte consisting of potassium and negatively charged hydroxyl (-OH) ions in water. The OH carries electrons, creating current inside the battery.
• Nickel Hydroxide
  Every battery has a positive and a negative electrode. In an NiMH cell, the positive...

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Photo: Jens Mortensen

The two biggest hassles with setting up surround sound: cables and calibration. The Aperion Intimus 4T Summit Wireless 5.1 system fixes both, with audiophile-friendly uncompressed streaming and ingenious sweet-spot technology. Where most wireless setups squeeze everything until Top Gun on Blu-ray comes out sounding like Airplane on VHS, Aperion uses the same high-speed frequencies as radar systems to stream audio in all its uncorrupted glory. Each individually powered speaker houses...