Photo of John Calhoun crouches within his rodent utopia-turned-dystopia
Universe 25, 1968–1973
A series of rodent experiments showed that even with abundant food and water, personal space is essential to prevent societal collapse.
ABOVE: Yoichi R. Okamoto, White House photographer, Public Domain
Universe 25, 1968–1973
Universe 25, 1968–1973

A series of rodent experiments showed that even with abundant food and water, personal space is essential to prevent societal collapse.

A series of rodent experiments showed that even with abundant food and water, personal space is essential to prevent societal collapse.

ABOVE: Yoichi R. Okamoto, White House photographer, Public Domain

population dynamics

Photo of Junyue Cao
Junyue Cao Applies Novel Approaches to Aging and Disease
Lisa Winter | Mar 14, 2022
The Rockefeller University geneticist is tracing the full lifespan of individual cells to better understand how and why humans age.
Farming Associated with Long-Term Decline in Marmot Populations
Shawna Williams | Dec 1, 2020
Images from a Cold War spy satellite help researchers piece together the effects of land-use decisions in Kazakhstan.
Image of the Day: Symbiotic Algae
Emily Makowski | Jan 13, 2020
Anemones keep their algae populations in check.
Homo sapiens Might Not Be Responsible for Neanderthal Demise
Catherine Offord | Nov 29, 2019
Researchers’ simulations suggest that small population sizes and inbreeding made Neanderthal populations vulnerable to chance fluctuations in population size.
Image of the Day: Puma Genome Sequencing
Emily Makowski | Oct 21, 2019
The big cats show signs of inbreeding despite conservation efforts to diversify their populations.
Saving the Hellbender, a Giant Salamander Under Threat
Mary Bates | Sep 1, 2019
Populations of the two-foot-long amphibians are declining across North America. Scientists are struggling to find out why, before it’s too late.
Eastern Monarchs Flourish While Western Numbers Plunge
Carolyn Wilke | Feb 8, 2019
In the last year, the butterfly’s eastern group has more than doubled its hibernation area while the other population waned. Plus, researchers are moving trees to save monarch habitat.
Save the Wolves, Control the Moose
The Scientist Staff | Sep 25, 2018
Researchers plan to relocate mainland wolves to an island in Lake Superior in an effort to boost the near-extinct predator population and limit the growth of local moose herds.
Study Finds Epigenetic Differences Between Hatchery-Raised and Wild-Born Salmon
Shawna Williams | Mar 1, 2018
The variation may help explain why stocked salmon don’t fare as well in the ocean.
Germany Sees Drastic Decrease in Insects
Anna Azvolinsky | Oct 18, 2017
A 27-year-long study finds insect biomass has declined by about 75 percent. 
Genetic Atlas
Abby Olena | Feb 17, 2014
Researchers trace the mixing of human populations using DNA.
Biology's Coefficient
Megan Scudellari | Dec 1, 2013
Joel Cohen uses the tools of mathematics to deconstruct questions of life.