Science

1. Credit

2. CreditRenaud Philippe for The New York Times

3. CreditThe New York Times

4. CreditCassandra Klos for The New York Times

5. Did You Really Need to Be There to See the Eclipse?

   For much of the 20th century, Rochester, N.Y., was the "imaging capital of the world." For three and a half minutes on Monday, it was living up to its old nickname.

    By Christopher Valentine and Gideon Jacobs

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Trilobites

1. CreditJorge Blanco

2. CreditAlexey Malgavko/Reuters

3. How a Snake Uses Its Sense of Smell

   These reptiles and their social networks are understudied, according to researchers applying scents to different snakes to assess their behavior.

    By Asher Elbein

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4. CreditBIAX Consult

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Origins

1. CreditBiophoto Associates/Science Source

2. CreditBlue Nile Survey Project

3. CreditLouise Johns for The New York Times

4. Tras la pista de los denisovanos

   El ADN ha demostrado que esos humanos ya extintos se extendieron por todo el mundo, desde la fría Siberia hasta el Tíbet, a una gran altitud, quizá incluso en las islas del Pacífico.

    By Carl Zimmer

   CreditMaayan Harel/Universidad Hebrea en Jerusalén, vía Associated Press

5. On the Trail of the Denisovans

   DNA has shown that the extinct humans thrived around the world, from chilly Siberia to high-altitude Tibet — perhaps even in the Pacific islands.

    By Carl Zimmer

   CreditMaayan Harel/Hebrew University in Jerusalem, via Associated Press

Climate and Environment

1. CreditKen Hill/National Park Service, Alaska

2. CreditRenata Ferrari/AIMS, via Reuters

3. CreditFrederic J. Brown/Agence France-Presse — Getty Images

4. CreditCalla Kessler for The New York Times

5. CreditJim Wilson/The New York Times

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7. Chinese Company Under Congressional Scrutiny Makes Key U.S. Drugs

   Lawmakers raising national security concerns and seeking to disconnect a major Chinese firm from U.S. pharmaceutical interests have rattled the biotech industry. The firm is deeply involved in development and manufacturing of crucial therapies for cancer, cystic fibrosis, H.I.V. and other illnesses.

   By Christina Jewett