Ethel Waters (1896–1977) was an American blues, jazz, and gospel vocalist and actress. She began her career in the 1920s singing blues, but later frequently performed jazz, big band, and pop music, on the Broadway stage and in concerts. In 1949 Waters was nominated for an Academy Award, the second African American (after Hattie McDaniel) to receive such a nomination. In 1962 she became the first African-American woman to be nominated for an Emmy Award. Her recordings include "Dinah", "Stormy Weather", "Taking a Chance on Love", "Heat Wave", and "Cabin in the Sky" .

Photograph: William P. Gottlieb; restoration: Adam Cuerden

The Inca tern (Larosterna inca) is a species of seabird in the family Sternidae and the only member of its genus. This piscivorous species is restricted to the Humboldt Current and breeds on the rocky coastal cliffs in Peru and Chile, laying one or two eggs which hatch after 4 weeks.

Photograph: Olaf Oliviero Riemer

Alatskivi Castle is a Neo-Gothic castle in Alatskivi, Estonia. Dating to the 17th century, it is situated in Alatskivi Parish, Tartu County. It was rebuilt in the late 19th century by Baron Arved von Nolcken, modeled on the royal residence of Balmoral in Scotland. A renovation occurred between 2005 and 2011. Five rooms on the first floor house the Eduard Tubin museum, which documents his accomplishments as a music composer and conductor.

Photograph: Ivar Leidus

Bacchus and Ariadne is an oil painting on canvas completed by Titian between 1522 and 1523. One of a cycle of paintings on mythological subjects produced for Alfonso d'Este, the Duke of Ferrara, it depicts the god Bacchus falling in love with Ariadne after she has been deserted by her lover Theseus. Behind Bacchus is a procession of revelers in a chariot drawn by two cheetahs. The painting now hangs in the National Gallery in London.

Painting: Titian

The maxima clam (Tridacna maxima) is a species of bivalve found throughout the Indo-Pacific. It is found on the surface of reefs or sand, or partly embedded in coral (as with this specimen), in the oceans surrounding east Africa, India, China, Australia, Southeast Asia and the islands of the Pacific. This clam is much sought after in the aquarium trade, as its often striking coloration—the result of crystalline pigment—mimics that of the true giant clam.

Photograph: Alexander Vasenin

The Solovetsky Monastery is a Russian Orthodox monastery in Solovetsky, Arkhangelsk, Russia. Founded in 1436 by the monk Zosima, the monastery grew in power into the 16th century, becoming an economic and political center of the White Sea region and eventually hosting 350 monks. After the Bolshevik Revolution, Soviet authorities closed down the monastery and incorporated many of its buildings into Solovki prison camp, one of the earliest forced-labor camps of the gulag system. The camp closed after the region's trees had been harvested. Today the monastery has been re-established, and also serves as a museum.

Photograph: Linazet

The Albanian water frog (Pelophylax shqipericus) is a species of true frog in the family Ranidae. It is native to Albania and Montenegro, where it lives in aquatic environments. The frogs are medium-sized. Males sometimes bear a distinctive bright green stripe down the length of the backbone, but otherwise are green to light brown in overall colouring with large black or dark brown spots. Females are olive green or light brown in colour and also bear brown or black large spots. The species is endangered and known populations are currently in decline.

Photograph: Benny Trapp

Peter Sellers (1925–1980) was a British film actor, comedian and singer. He performed in the BBC Radio comedy series The Goon Show, featured on a number of hit comic songs and became known to a world-wide audience through his many film characterisations, among them Chief Inspector Clouseau in The Pink Panther series of films. Sellers's versatility enabled him to portray a wide range of comic characters using different accents and guises, and he would often assume multiple roles within the same film, frequently with contrasting temperaments and styles, as in Dr. Strangelove. Satire and black humour were major features of many of his works, and his performances had a strong influence on a number of later comedians.

Photograph: Allan Warren; edit: Keraunoscopia

A gnomonic projection of a portion of the northern hemisphere, centered on the geographic North Pole. Such projections display all great circles as straight lines, resulting in any line segment on a gnomonic map showing the shortest route between the segment's two endpoints.

Map: Strebe, using Geocart

Buffalo Bull's Back Fat was chief of the Kainai Nation, one of the three tribes which make up the Blackfoot Confederacy, during the early 19th century. This portrait of him was completed at Fort Union in 1832 by George Catlin and is now held by the Smithsonian American Art Museum.

Painting: George Catlin

Corals are marine invertebrates that typically live in compact colonies of many identical individual polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in length. Corals are major contributors to the physical structure of the coral reefs such as the Great Barrier Reef, where this photograph was taken. Coral reefs are under threat globally from ocean acidification and climate change.

Photograph: Toby Hudson