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Tropical Storm Pilar formed near the southwestern coast of Mexico on Saturday, Sept. 23 and continued hugging the coast when NASA's Terra and Aqua satellites passed overhead. Pilar weakened to a tropical depression during the late morning on Sept. 25.

The final days of August signaled summer’s end for those of us in the Northern Hemisphere. So, how did this summer compare to others?  

For the entire globe, both August and the season (June, July and August) each went down as the third warmest on record. But depending on where you live, the summer you experienced may have felt warmer or cooler than normal.    

A section of ice more than 100 square miles in size — four times as large as Manhattan — has broken off the Pine Island Glacier in West Antarctica. It is the fifth major calving, or ice loss, event on the glacier since 2000.

Researchers have discovered a new class of enzymes in hundreds of bacterial species, including some that cause disease in humans and animals. The discovery provides new insights into how bacteria invade their hosts. The research appears this week in Nature Communications.

A deadly amphibian disease called severe Perkinsea infections, or SPI, is the cause of many large-scale frog die-offs in the United States, according to a new study by the U.S. Geological Survey.

Frogs and salamanders are currently among the most threatened groups of animals on the planet. The two most common frog diseases, chytridiomycosis and ranavirus infection, are linked to frog population declines worldwide. The new study suggests that that SPI is the third most common infectious disease of frogs.