Amelia Hunt (left), principal of Stevens Early Learning Center in Washington, D.C., and Dr. Craig DeWolfe, a hospitalist at Children's National.
Lulu Garcia-Navarro/NPR
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In Washington, D.C., hospital staff vaccinated 1,750 public school workers in one day. It was a hard-won success amid a fragmented nationwide vaccination campaign fraught with challenges.
Amelia Hunt (left), principal of Stevens Early Learning Center in Washington, D.C., and Dr. Craig DeWolfe, a hospitalist at Children's National.
Lulu Garcia-Navarro/NPR
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A giant kauri tree grows in Waipoua Forest in Northland, New Zealand. Trees like this one that fell long ago and were preserved for thousands of years are helping researchers discern fluctuations in the Earth's magnetic poles.
Kim Westerskov/Getty Images
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