Northwest Passage's history marked by dangers, death

European explorers had long speculated about the existence of an Arctic route that connected the Atlantic and Pacific Oceans and would avoid the long journey around South America's Cape Horn.

Facebook to test news story paywalls: report

Facebook will test limiting the number of published news stories that can be read for free on its Instant Articles platform for premium publishers, US media reported on Wednesday.

Here's a tip: Indented cement shows unique properties

Rice University scientists have determined that no matter how large or small a piece of tobermorite is, it will respond to loading forces in precisely the same way. But poking it with a sharp point will change its strength.

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