1.   Scientists have observed a drop in ozone levels over the Antarctic.

2.   Ozone is most severely depleted over the poles, although some loss of ozone in temperate regions has already been observed by scientists.

3.   In recent months, scientists have observed coral reefs around the globe to be turning gradually white.

4.   And for the first time, scientists observed evidence of Lewy bodies.

5.   As they try to understand the relationship between the faults, scientists have observed a striking similarity between the Northridge and Sylmar events.

6.   But Nancy Creel said scientists had observed many cases where dogs would bring back food to a wounded mate, sometimes for months at a stretch.

7.   His experiment aboard the shuttle permitted scientists to observe how two types of dust particles behaved after they were dispersed in weightlessness by Columbia crewman Fred Leslie.

8.   In these populations, scientists have observed sexually aggressive behaviors in males resulting in the deaths of females and younger animals.

9.   In the most typical cases, the patients have been taken off their medicines while scientists observe their return of psychotic symptoms.

10.   One project under discussion is the so-called Square Kilometer Radio Telescope, which would enable scientists to observe the birth of galaxies.