Urinating whilst standing up

Channel Hopper

Suffering fools, so you don't have to.
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And how it is linked to black holes

Plateau–Rayleigh instability occurs in urination, particularly standing male urination. The stream of urine experiences instability after about 15 cm (6 inches), breaking into droplets, which causes significant splash-back on impacting a surface. By contrast, if the stream contacts a surface while still in a stable state – such as by urinating directly against a urinal or wall – splash-back is almost completely eliminated.

http://en.wikipedia.org/wiki/Plateau–Rayleigh_instability

We describe the behavior of 5-dimensional black strings, subject to the Gregory-Laflamme instability. Beyond the linear level, the evolving strings exhibit a rich dynamics, where at intermediate stages the horizon can be described as a sequence of 3-dimensional spherical black holes joined by black string segments. These segments are themselves subject to a Gregory-Laflamme instability, resulting in a self-similar cascade, where ever-smaller satellite black holes form connected by ever-thinner string segments. This behavior is akin to satellite formation in low-viscosity fluid streams subject to the Rayleigh-Plateau instability. The simulation results imply that the string segments will reach zero radius in finite asymptotic time, whence the classical space-time terminates in a naked singularity. Since no fine-tuning is required to excite the instability, this constitutes a generic violation of cosmic censorship.

http://relativity.livingreviews.org/open?pubNo=lrr-2008-6&page=articlese3.html
 

PaulR

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Now that's just taking the pi...
 

2cvbloke

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Soooooo, every time I wee, I risk tearing a hole in space? Cool... :D
 

skomedal

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Presume you lower underwear first:-rofl2

Not all members are male.

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2cvbloke

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Presume you lower underwear first:-rofl2

Well, if it's true that a pee stream that impacts something else before it breaks up is not forming black holes, then wetting yourself is less likely to cause the universe to collapse in on itself, but, I'll take the risk of opening a black hole, at least with one of those in the throne, you're not going to splash on the floor... :-rofl2
 
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