This is known as Buffon's needle problem, after the French mathematician Georges-Louis Leclerc, Comte DE Buffon, who first proposed it in 1733.

这就是著名的蒲丰针问题，由法国数学家乔治·路易·勒克莱尔蒲丰伯爵在1733年第一次提出。

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Ren Delin had extended it to long needle problem, who cancelled the limitation (the diameter of the convex domain is less than the distance of the grid of parallel lines).

任德麟作了进一步推广，即取消凸域直径不超过带域间距离这一限制。

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Now a grandmother claims to have solved the problem - by redesigning the needle.

再怎么沾湿线头往针眼里送，再怎么眯着眼睛对上灯光，反正就是穿不进。 现在，一位奶奶宣布这个问题已经解决——方法是，重新设计一种针。

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And as we get better and better at building these expert recommendation engines, we may be able to turn the problem of finding a needle in a haystack, into finding a haystack of needles.

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Problem is, whether the needle moves on this indicator or not, the approach is unlikely to contribute to broader neighborhood transformation.

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