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This Week in Science: Giant Octopuses, a Promising Cancer Vaccine, And More!

This week in science: paleontologists discover that gigantic octopuses the size of whales once roamed the world's oceans; a personalized cancer vaccine shows promise in early human trials; the Curiosity rover finds 'dragon scales' on Mars; and much more! Tinnitus May Be Linked to a Crucial Brain Chemical [caption id="attachment_198619" align="alignnone" width="642"] (seb_ra/iStock/Getty Images Plus)[/caption] The severity of tinnitus may be linked to levels of serotonin in a specific brain circuit, according to a new study in mice.

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