Neuroscientist Simon LeVay has written an absolutely superb book, aimed at the general reader, discussing in detail what we now know.

神经科学家西门李若兮针对普通的读者写了一本绝对精湛的书，详细讨论了我们现在所知道的。

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Officer Levay, 27, was shot in the back but saved by his bulletproof vest.

BBC: Three New York police officers shot and wounded

Police Commissioner Raymond Kelly told reporters Officer Levay was able to return fire, killing the unnamed gunman.

BBC: Three New York police officers shot and wounded

At 19:30 local time (00:30 GMT), plain-clothed officers Lukasz Kozicki and Michael Levay were on a subway train in Brooklyn when they saw a man move between carriages, city officials said - a clear violation of subway rules.

BBC: Three New York police officers shot and wounded