populations
Boys May Shorten a Mother’s Life
Boys May Shorten a Mother’s Life
Edyta Zielinska | Feb 28, 2013
Women living in the 17th to 19th centuries had a slightly lower life expectancy if they gave birth to multiple sons, rather than to daughters.
Rare Alleles Rise with Population
Megan Scudellari | May 11, 2012
As the human population expands, the number of rare genetic variants has dramatically increased.
World Population Hits 7 Billion
Tia Ghose | Oct 31, 2011
Sometime today, Earth’s 7 billionth person was born.
Opinion: The Burden of Borders
Jesse R. Lasky | Oct 17, 2011
US border policy and fences threaten wildlife across the continent.