The Eastern Barred Bandicoot (Perameles gunni) is a small, rabbit-sized marsupial native to Australia and Tasmania. It weighs less than 1 kg (2.2 lb) and has a short tail and three to four whitish bars across the rump. It is classified as Near Threatened, with one subspecies listed as Critically Endangered.

Photo: JJ Harrison

Diatomaceous earth – a naturally occurring, soft, siliceous sedimentary rock made up of the cell walls/shells of single cell diatoms – as viewed under bright field illumination on a light microscope. The primary uses of diatomaceous earth are for cleaning (scouring), filtration, heat-resistive insulation and as an inert absorbent substrate.

Photo: Richard Wheeler

Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore near Keystone, South Dakota, United States. Sculpted by Danish-American Gutzon Borglum and his son, Lincoln Borglum, it features 60-foot (18 m) sculptures of the heads of former United States presidents (in order from left to right) George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln.

Photo: Dean Franklin

The skyline of Chicago, the third most populous city in the United States. Chicago was incorporated on March 4, 1837, near a portage between the Great Lakes and the Mississippi River watershed. This panorama of the Near South Side, Loop and Near North Side community areas, taken from the Museum Campus, includes some of the tallest buildings in the city and the world.

Photo: Daniel Schwen

Tungsten rods with evaporated crystals, partially oxidized with colorful tarnish, as well as a 1 cm³ tungsten cube for comparison. Tungsten is a hard, rare metal under standard conditions when uncombined and is found naturally on Earth only in chemical compounds. Its chemical symbol is W, which represents its alternative name, "wolfram".

Photo: Alchemist-hp

The Alamo is a Roman Catholic mission located in San Antonio, Texas, United States. It was the site of the Battle of the Alamo during the Texas Revolution, in which almost all the Texian Army defenders were killed. Today, it is one of the most popular historic sites in the US.

Photo: Daniel Schwen

The Laughing Kookaburra (Dacelo novaeguineae) is a carnivorous bird in the kingfisher family. Native to eastern Australia, it has also been introduced to parts of New Zealand, Tasmania and Western Australia. Male and female adults are similar in plumage, which is predominantly brown and white. A common and familiar bird, this species of kookaburra is well known for its laughing call.

Photo: JJ Harrison

A human eye displaying partial heterochromia iridum, where part of one iris is a different color from its remainder. Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Shown here is an example of central heterochromia, where there are two colors in the same iris.

Photo: Adam Cuerden

The Collaroy, one of the ships that comprise the fleet of the Manly ferry services, connecting Manly, New South Wales, Australia, to Circular Quay in Sydney. The services are provided by Sydney Ferries, an agency of the Government of New South Wales. Ferry services began in Manly in 1855 and have been instrumental in promoting the development of Manly.

Photo: David Iliff

The Peacock butterfly (Inachis io) is a widespread butterfly species, found in Europe and temperate Asia, as far east as Japan. It has a wingspan of 50–55 mm (2.0–2.2 in). The base-colour of the wings is a rusty red, and at each wingtip it bears a distinctive eyespot, which has been much studied for its role as an anti-predator mechanism.

Photo: Korall

Mycena inclinata, commonly known as the clustered bonnet, is a widespread species of mushroom in the Mycenaceae family. It is found in Europe, North Africa, Asia, Australasia, and North America, where it grows in small groups or tufts on fallen logs and stumps, especially of oak.

Photo: Stu Phillips