Does Sharing the Womb with a Brother Affect Girls?
Does Sharing the Womb with a Brother Affect Girls?
A study links having a male twin with women’s educational, financial, and childbearing decisions. Researchers suspect prenatal exposure to testosterone may play a role.
Does Sharing the Womb with a Brother Affect Girls?
Does Sharing the Womb with a Brother Affect Girls?

A study links having a male twin with women’s educational, financial, and childbearing decisions. Researchers suspect prenatal exposure to testosterone may play a role.

A study links having a male twin with women’s educational, financial, and childbearing decisions. Researchers suspect prenatal exposure to testosterone may play a role.

twins
Doctors Report World’s Second Case of “Semi-Identical” Twins
Doctors Report World’s Second Case of “Semi-Identical” Twins
Catherine Offord | Feb 28, 2019
The extremely rare event, thought to be caused by two sperm cells fertilizing the same egg simultaneously, was last reported in 2007.
Image of the Day: Conjoined and Separated
Image of the Day: Conjoined and Separated
Carolyn Wilke | Jan 28, 2019
Now two years old, the Delaney twins were born joined at the head and were successfully separated in June 2017.
Claim of First Gene-Edited Babies Triggers Investigation
Claim of First Gene-Edited Babies Triggers Investigation
Catherine Offord | Nov 26, 2018
He Jiankui says he has successfully used CRISPR-Cas9 to tweak the genes of twins born earlier this month. Some independent experts are dubious.
Image of the Day: Elephant Twins
Image of the Day: Elephant Twins
The Scientist Staff, The Scientist Staff | Apr 16, 2018
A pair of calves was born about eight months ago in Tanzania’s Tarangire National Park.
Mosquitoes Play Genetic Favorites
Mosquitoes Play Genetic Favorites
Jef Akst | Apr 23, 2015
A twin study suggests that the blood-sucking insects are more attracted to people with certain genes.
Environmental Immunity
Environmental Immunity
Jenny Rood | Jan 16, 2015
Twin study shows environmental factors play a greater role than genetic ones in shaping individual immunity.
Gut Microbiome Heritability
Gut Microbiome Heritability
Tracy Vence | Nov 6, 2014
Analyzing data from a large twin study, researchers have homed in on how host genetics can shape the gut microbiome.
Test Scores Are in the Genes
Test Scores Are in the Genes
Jef Akst | Dec 16, 2013
More than school or family environment, a child’s genetics influences high school exam results.
The Neurobiology of Individuality
The Neurobiology of Individuality
Dan Cossins | May 9, 2013
Mice that explore more have higher levels of neurogenesis, suggesting a link between experience, brain plasticity, and the emergence of distinct personalities.