11.   The agency says there is no certain way to determine the age at which health and skills deteriorate dangerously.

12.   The commissioner of immigration and naturalization, James W. Ziglar, has said the agency is reviewing its use of X-rays to determine age.

13.   The Dominican Republic seems to have more trouble determining the age of its baseball players than scientists do carbon-dating prehistoric insects.

14.   The immigration commissioner, James Ziglar, has said the agency was reviewing its use of X-rays to determine age.

15.   The instruments assess the radioactive content of the sediments, a measurement that helps determine their age.

16.   The most reliable means of dating such ancient material is to determine the age of volcanic ash in the sediments, but none is associated with the Solo specimens.

17.   The officers who found Nadine and carried her from her crib could not determine her age, because she was so small and emaciated.

18.   The researchers determined the age of the seeping liquid by radiocarbon dating.

19.   Through research using other telescopes, such as the Keck telescope in Hawaii, scientists hope to determine the ages of the galaxies in the Hubble picture.

20.   To determine the age of a mirror, he suggested touching the bevel of the glass.