Elephant toothpaste is the name given to the catalyzed decomposition reaction of 30% hydrogen peroxide that uses soap to collect the oxgen gas that is produced. It is a favorite of most students at chemistry shows.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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