In a recent issue of the journal BioScience, ecologist Jeffrey Levinton of Stony Brook University, New York, offered a well-written review of the current status of the “Cambrian Explosion” hypothesis and presented at least two enigmas in evolutionary thinking.¹

On October 7, 2008, University College London professor and geneticist Steve Jones delivered a bold lecture entitled “Human evolution is over.”¹ In the past, he stated, elderly fathers provided more mutations for evolution to work with. Now that men are becoming fathers at younger ages, humans are not evolving much at all.

Biologists are having a difficult time figuring out how to fit a tropical fish’s rapid coloration changes into the story of evolution. A new study examined the role these changes play in the fish’s mating habits, and concluded that they could contribute to the development of different species.

Researchers accidentally discovered what appears to be tiny footprints in Precambrian rock.

Advancing technology continues to reveal new aspects of cellular function. Molecular biologists have known that “stressosomes,” large protein complexes in bacterial cells, play some role in enabling single-cell life forms to cope with ever-changing environments.