A bonobo, formerly called a pygmy chimpanzee, is eating fruit in the Democratic Republic of the Congo. Bonobos, chimps, gorillas and humans have all evolved their own gut microbes based on an ancestral gut flora in our most recent common ancestor. Credit: Alexander Georgiev photo, courtesy of Science

A bonobo, formerly called a pygmy chimpanzee, is eating fruit in the Democratic Republic of the Congo. Bonobos, chimps, gorillas and humans have all evolved their own gut microbes based on an ancestral gut flora in our most recent common ancestor. Credit: Alexander Georgiev photo, courtesy of Science

Image of the cave discoveries. Credit: University of Leicester

Image of the cave discoveries. Credit: University of Leicester

Global climate change caused by soot aerosol at the K-Pg boundary. Credit: Kunio Kaiho

Global climate change caused by soot aerosol at the K-Pg boundary. Credit: Kunio Kaiho

Neanderthal depiction (stock image). Neanderthals lived in the Middle Paleolithic, the middle period of the Old Stone Age. This period encompasses the time from roughly 200,000 to 40,000 before our times. Credit: © procy_ab / Fotolia

Neanderthal depiction (stock image). Neanderthals lived in the Middle Paleolithic, the middle period of the Old Stone Age. This period encompasses the time from roughly 200,000 to 40,000 before our times. Credit: © procy_ab / Fotolia

Great Blue Heron (Ardea herodias) flying. Credit: © Yuval Helfman / Fotolia

Great Blue Heron (Ardea herodias) flying. Credit: © Yuval Helfman / Fotolia

A slab of rock from a study site in Nevada harbors many specimens of Metabolograptus extraordinarius, a shallow-water graptolite species, which together with some close relatives, replaced all the formerly dominant species following the end-Ordovician mass extinction. Credit: Charles E. Mitchell

A slab of rock from a study site in Nevada harbors many specimens of Metabolograptus extraordinarius, a shallow-water graptolite species, which together with some close relatives, replaced all the formerly dominant species following the end-Ordovician mass extinction. Credit: Charles E. Mitchell

A specimen of the newly identified fossil species Ticinolepis crassidens (above) and of the species Ticinolepis longaeva. Credit: Adriana López-Arbarello

A specimen of the newly identified fossil species Ticinolepis crassidens (above) and of the species Ticinolepis longaeva. Credit: Adriana López-Arbarello

This is a skull and body reconstruction of the new dinosaur species, Murusraptor barrosaensis. Credit: Coria et al (2016); CCAL

This is a skull and body reconstruction of the new dinosaur species, Murusraptor barrosaensis. Credit: Coria et al (2016); CCAL

Metatarsal (a) and (b) surface rendered models show medullary spongy bone infill and clear focalized cortical destruction near the periosteal margin; also evident on external cortical margin directly abutting malignant neoplasm is the characteristic hair on end bone reaction in (b). Credit: Edward Odes (Wits)

Metatarsal (a) and (b) surface rendered models show medullary spongy bone infill and clear focalized cortical destruction near the periosteal margin; also evident on external cortical margin directly abutting malignant neoplasm is the characteristic hair on end bone reaction in (b). Credit: Edward Odes (Wits)

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