Just how many hidden dimensions exist depends on the theory, but some versions of the popular string theory for example, postulate we live in a 10 - or 11-dimensional universe.

究竟存在着多少隐藏的维度，这个问题仅依赖于理论，但流行弦理论的一些版本，作为例子，假设我们生活的宇宙，有10维或11维。

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Insect webcams are not so popular, but a few exist, including one of Madagascar hissing cockroaches.

昆虫网络直播并不流行，但也有一些例外，比如一种马达加斯加的发声蟑螂。

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This might seem like a new idea, but it's actually a very old one -indeed, it was a popular explanation among theologians in medieval Europe for how a vampire might exist.

这看起来是个新的理念，但实际上是很老的一个——其实这是中世纪欧洲神学家对于吸血鬼存在方式的观点。

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"If something is not in the popular imagination, it does not exist, " says Searles.

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Dozens of consumer-centric solutions exist to share documents and other files, including popular options such as Dropbox.

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For example, one reason new photo app Snapchat has become enormously popular lately, may be because it lets users decide how long a photo will exist (usually a few seconds) before it self-destructs.

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