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Science news this week: Spiders on Mars and an ancient Egyptian sword

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A 3,200-year-old Egyptian barracks contains a sword inscribed with 'Ramesses II' Archaeologists in Egypt recently unearthed the remains of a military barracks containing a sword with hieroglyphs depicting the name of Ramesses II .

A giant mosasaur's fossilized jaw fragments still hold the animal's blunt, mushroom-shaped teeth.

Bruno Vellutini's video was chosen from among 370 entries as overall winner of the competition.

He captured the film using light sheet microscopy, a technique in which a focused "sheet" of laser light illuminates a sample to produce high-resolution 3D images of living cells, tissues and organisms.