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    Livionex dental gel --a plausible improvement on toothpaste?

    This dental gel aims to disrupt the toothpaste market with a new mechanism of action. As far as I understand, brushing with it boosts the negative charge on tooth surfaces, making it more difficult for bacteria to attach... even though bacteria are also negatively charged... Presumably, this...
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    I If the observable universe was visible to the naked eye...

    What would the Earth's night sky look like? Would our eyes see any dark spots? Is there are way to calculate such a probability? This hypothetical is about the observable universe only. 93 billion light-years diameter, isotropic, visible light. Not sure what's the most appropriate tag for this...
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    B What is vacuum energy?

    I often wonder about how little I understand vacuum, and only recently I've been paying attention to this "vacuum energy" hypothetical. I see it being associated with things as small as spontaneous emissions to things as large as the expansion of the universe. This is a huge range of length...
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    B Superfluid Perpetual Motion?

    Yes, I'm aware of the countless threads about perpetual motion here. Not sure if this idea has been considered with superfluids, though. I'm no physics expert (basically a laymen), but the idea of a superfluid in perpetual motion intrigues me because I can't imagine why it wouldn't be possible...
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    A rare breed of online IQ test

    That doesn't artificially inflate your results. So I'm curious to see how accurate it is (perceived to be) among the 'general population'. 43 minutes to solve out 38 pattern recognition problems. I scored 113 (SD15). Way less than what I usually get in this kind of online IQ games (130s/140s)...
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