A young parader covers her face at the end a school Christmas parade on December 21 in Loiza, Puerto Rico. While the official death toll from the massive storm remains at 64, The New York Times recently reported the actual toll for the storm and its aftermath likely stands at more than 1,000. Puerto Rico's governor has ordered a recount as the holiday season approaches.

A young parader covers her face at the end a school Christmas parade on December 21 in Loiza, Puerto Rico. While the official death toll from the massive storm remains at 64, The New York Times recently reported the actual toll for the storm and its aftermath likely stands at more than 1,000. Puerto Rico's governor has ordered a recount as the holiday season approaches.

Tuesday, Dec 26 10 a.m. (ET)

Months After María

Much of the power is back on in Puerto Rico, but the problems caused by Hurricane Maria still plague the island.

Black holes, like the one seen in this visualization, present a host of possibly unknowable questions about physics and the nature of the universe.

Black holes, like the one seen in this visualization, present a host of possibly unknowable questions about physics and the nature of the universe.

Tuesday, Dec 26 11 a.m. (ET)

The Great Unknown With Marcus Du Sautoy (Rebroadcast)

Do electrons have free will? And what is free will, anyway? Scientists are closing in on the big questions, but some mysteries of the universe may never be solved.

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