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For once, "shadow of the atom" is not just a poetic metaphor for the nuclear age. The black dot at the center of this image is, literally, the shadow cast by a single atom of ytterbium, magnified 6500 times.
In this video for Science Friday, bat biologist Nickolay Hristov takes a thermal camera inside Carlsbad Caverns to see what bats do in the dark when nobody's watching.
In his footage, a blazing yellow blob on the cave ceiling—which the video's narrator likens to a pool of lava—is actually a mass of bats, packed closely together and hanging upside down. Here, Hristov can see, in person, the very social world of bats, playing out as though he weren't even there.
It's a great video, and well worth watching.
Via Science Friday
EDIT: Video embed is fixed and should work now.
It sure seems like a completed structure at first glance. But look closer. Specifically, look at the piles of stone blocks stacked on top of the columns.
Those blocks were hauled up there during construction—around the turn of the 20th century. They were supposed to be carved into sculptures representing "Music", "Architecture", "Painting" and, ironically, "Sculpture". Instead, the stone has sat there for 110 years, through two major renovations, un-carved and largely ignored.
Via Amy Vernon