Does the science bonus of multiple scientists stack?

Does the science bonus of multiple scientists stack? - Woman Using the Microscope

A kerbal of the Scientist class who gained a few levels gives you a percentual bonus to all science collected by the vessel he is on. What happens when you have multiple scientists on board? Do their bonuses stack or is only the bonus of the best scientist used?

kerbal-space-program

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Does the science bonus of multiple scientists stack? - Scientist Checking Crops in Laboratory

Does the science bonus of multiple scientists stack? - Two Scientists Working Inside the Laboratory

Does the science bonus of multiple scientists stack? - Two Scientists Working Inside the Laboratory

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Images: Edward Jenner, ThisIsEngineering, Edward Jenner, Edward Jenner