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If bumblebees were propelled the way fixed-wing aircraft are propelled, their wings would not be aerodynamic. An airplane needs two devices to become and remain airborne. Its engines generate thrust, and its wings provide lift. A bumblebee, however combines both thrust and lift into one integrated device. The bumblebee's wings, unlike a fixed wing ...


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This is not true. The rumor comes from a paper written in the 30s. The scientist, Antoine Magnan, who made the paper did his calculations wrong and retracted the paper, but, of course, the media wouldn't listen.


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Perhaps I could share some idea for further research. If we could make actual and correct pressure measurements in the cochlea to reveal wether the non-stationary Bernoulli effect is a good description of the actual physics-of-how-the-cochlea-isolates-frequencies-along-its-length? I would consider: I would propose to use a pitot tube, with sensor in the ...


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The potential difference between the two points on the wire is negligible at all times but initially there's a potential difference between the wire and the bird and there would be a (very short lived) transient current which is similar to electrostatic discharge you feel when you touch an object with electrostatic charge build-up.


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Oh, I love this subject. The term here is radiation hormesis, and it's basically off-limits for nuclear regulators (If it's true, it horribly complicates the risk analysis for the use of any radiation source). The classic study comes from Taiwan http://www.jpands.org/vol9no1/chen.pdf where a number of apartment buildings were built using rebar that had been ...


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What Floris points to is not all that strange. Living organisms exist in a state that is extremely far removed from thermal equilibrium, a lot of work is constantly being performed to maintain itself. So, even without any radiation, the body would fall apart on quite short time scales, were it not for the processes at work that do all the self repair work. ...


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There is some interesting data on the subject. People looked at the relationship between the prevalence of radon in counties in the US with the mortality due to lung cancer, and found a surprising relationship. Instead of the "more radon kills more people" correlation that was expected, there was an initial "dip" in the curve - as though "a little bit of ...


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The cochlea has a complex physical structure, with multiple membranes and fluid-filled chambers. Therefore to explain the separation of frequencies along the basilar membrane of the cochlea is complex to. Sure, there are a lot of very general descriptions (even the answer of theblackcat) and a lot never go into the actual physics of the system. This ...


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If two twins (or clocks) decide to go live in differently strong gravity wells, they will age at different rates. It isn't based on where you were born. In particular it is not just that different planets spin at different rates or orbit their stars at different rates. Clocks just tick slower in a deeper gravity well. Hearts beat slower. Synapses fire ...


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For our three compartment hearing sense, from a physics point of view, there is a basilar membrane stimulation, from base to apex, in its pathway in the cochlea, to a place on the basilar membrane. By periodic movement of perilymph, non viscous fluid, backwards and forewards, in the cochlear duct meet the conditions of a potential flow. The basilar ...



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