Image of two young men fighting with long thin sticks

Mursi Tribe stick fighters • Photo by Rod Waddington (CC BY-SA 2.0)

Image of a group of tractors harvesting a large field of crops

Photo by James Baltz on Unsplash

Image of a man in silhouette observing the sunrise

Photo by Silviu Zidaru on Unsplash

Illustration of human chromosomes arranged into rows

Human chromosomes • Bolzer et al. (CC BY-2.5)

Aerial image of several mechanical harvesters working in a wide expanse of crops

Photo by James Baltz on Unsplash

Image of a statue of William Shakespeare with a leaf from a tree placed into its lifted hand

Photo by Taha on Unsplash

Image of a hummingbird hovering and feeding from a flower

Bahama woodstar • Photo by Under the Same Moon... (CC BY 2.0)

Image of Caenorhabditis elegans

Caenorhabditis elegans • Image by Bob Goldstein, UNC Chapel Hill (CC BY-SA 3.0)

Close-up image of a mosquito feeding on human blood

A mosquito of the genus Anopheles • Jim Gathany/CDC (Public Domain)

Image of a Greek bust with the top half of the head broken away

Photo by Levi Meir Clancy on Unsplash