1. Volume 18, Issue 13, Pages R537-R538 (July 2008)
Birth defects 
Nigel Williams 
Current Biology 
Volume 18, Issue 13, Pages R537-R538 (July 2008)
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2. Bias: The restriction in number of children in China and other Asian countries has led to a rise in the number of male children born. (Picture: AP Photo/Chitose Suzuki.)
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3. Worried: Charles Darwin was one of the most distinguished biologists to consider the implications of an expanding human population. (Picture: Library of Congress/Science Photo Library.)
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