Pedestrians in Tokyo watch as Emperor Akihito speaks to the nation. In the rare video message, Akihito said old age and illness may make it difficult for him to fulfill his public duties. Tomohiro Ohsumi/Getty Images hide caption

Russian President Vladimir Putin enters the St. George Hall of the Grand Kremlin Palace in Moscow. Sergei Ilnitsky/AFP/Getty Images hide caption

Delegates hold up signs with the Clinton campaign slogan during last month's Democratic National Convention in Philadelphia. Robyn Beck/AFP/Getty Images hide caption

Shokugeki no Soma is about a boy named Sōma Yukihira who dreams of becoming a chef. Courtesy of VIZ Media hide caption

Students perform a creative writing exercise at Cold Water Well Middle School. Students write descriptive prose from the perspective of a human statue, a blind person feeling the statue, and an outside observer. Anthony Kuhn/NPR hide caption

This is what's called a "specimen lot" — a large mason jar holding smaller vials of parasitic worms gathered by a researcher in 1927. The Smithsonian collection has more than 120,000 specimen lots. Kristin Adair/NPR hide caption