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Posts with the tag « science » :

🔗 Braess's paradox - Wikipedia, the free encyclopedia

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For each point of a road network, let there be given the number of cars starting from it, and the destination of the cars. Under these conditions one wishes to estimate the distribution of traffic flow. Whether one street is preferable to another depends not only on the quality of the road, but also on the density of the flow. If every driver takes the path that looks most favorable to him, the resultant running times need not be minimal. Furthermore, it is indicated by an example that an extension of the road network may cause a redistribution of the traffic that results in longer individual running times.

🔗 Just A Theory » Waiting for sex - a “formula” story with a difference

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The research shows that when the game plays out, a “good” male will participate longer than a “bad” male, allowing the female to weed out a suitable mate: the longer they hang around, the more likely it is that the male will be “good”. [...] What this research provides is a possible explanation for the evolution of lengthy courtships in many species, including humans.

🔗 Zarrintan, S "Ejaculation as a potential treatment of nasal congestion in mature males" The Journal of Medical Hypotheses, 71(2), 2008.

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So the author proposes a more...natural method of decongestion. "It is known that sexual arousal in men is followed by penile erection and subsequent ejaculation" (unless of course you've taken too much Viagra or something). The emission phase of ejaculation is under the control of the sympathetic nervous system, which of course has lots of adrenergic receptors. The author reasons that ejaculation will stimulation adrenergic receptors in the refractory period immediately afterward, and stimulation of your adrenergic receptors will give you relief from your cold.