And there's actually a way that we can make predictions here, and what I'll tell you is molecular orbital theory predicts that h e 2 does not exist because it's not stabilized in terms of forming the molecule.

其实我们有一种办法可以做出预测，我要告诉你们的是分子轨道,理论预测He2不存在,因为它形成分子不稳定。

麻省理工公开课 - 化学原理课程节选

So far, Lewman says, Tor's developers haven't figured out how that probe is able to determine what's an encrypted connection to a Tor server and what's a connection to an encrypted banking or e-commerce site, which in theory should both look to a snooping government like indecipherably scrambled Web traffic.

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It was often remarked that the doctors who attended the least fancy schools (i.e. those that emphasized practice over theory) actually arrived on the wards the most prepared to take care of patients, while those who benefited from what was presumably an enlightened and intellectually enriched curriculum often stumbled initially when they had to take care of an actual person.

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This period of conflict may last for decades, particularly if the new paradigm comes, not from some of the existing leaders of the current scientific establishment but rather from some unexpected and peripheral source, e.g. the dramatically different theory of genetics coming from Gregor Mendel in Moravia or a revolutionary theory of stomach ulcers from Barry Marshall in Perth, Australia.

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