NPR News: The iceberg cometh: It's the size of Oahu, and it's moving into the open ocean

The iceberg cometh: It's the size of Oahu, and it's moving into the open ocean
"It's a trillion tons of ice," as one expert told NPR. Now the largest iceberg in the world, A23a, is on the move after decades of being grounded on the seafloor.

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