It was once a spotless dome, a breathtakingly beautiful backdrop for family photos and annual pilgrimages to the cherry blossoms. But dark slime and grime now covers the top of the Jefferson Memorial, ...
Add Yahoo as a preferred source to see more of our stories on Google. Hagfish© Peter Southwood, CC BY-SA 4.0 Hagfish slime is a rapid-deploy chemical defense that can clog a shark’s gills in seconds.
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