Test-tube tiger birth marks IVF milestone at National Zoo
Scientists report success with in vitro fertilization producing Mary Alice the 20 pound aes tiger cub at the National Zoo. She survived birth by cesarean on April 27 after being conceived with a surrogate Siberian tiger. Endangered tigers face extinction with only a few kept in zoos.
MENTIONED IN THIS ARTICLE
Washington
Mary Alice
National Zoo
Arct ic ice loss prompts calls for closer Arctic monitoring
A study led by Peter Wadhams reports a Nevada-size Arctic region losing about 15 percent of its ice from 1976 to 1987, drop linked to potential warming but not proven. Researchers urge intensified monitoring to discern long term thinning from natural variation and discuss implications for hotter summers and altered rainfall.
MENTIONED IN THIS ARTICLE
New York
Arctic
Peter Wadhams
Wadhams
University of Cambridge
England
Nature
John Walsh
University of Illinois
Walsh
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