101.   The transplant bank was no longer needed after scientists learned how to make artificial blood vessels from Dacron.

102.   The use of thorotrast was halted after scientists learned of its harmful effects to the liver.

103.   While the fallout has taken its toll on much flora and fauna, scientists learned that the absence of humans allowed other species to develop.

104.   What these scientists learn about HPE could open new insight into numerous other brain disorders, such as cerebral palsy.

105.   That outbreak enabled scientists to learn more about the disease which had already been monitored in Zaire and in Sudan.