When was the last time you saw one of these? This classic children's toy seems very simple, but the chemistry involved is very interesting. Do you know how it works?
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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