1.   The persistence of binge drinking in college has baffled researchers.

2.   These numbers baffle cancer researchers.

3.   Without the Koelle stain, Vessell said, the nature of enzyme action there baffled researchers.

4.   Ebola virus baffles researchers because no one has discovered where the virus originated or whether an animal serves as its natural host.

5.   The Sunday Independent said researchers were baffled by the fact that only a few hundred of these weapons were used in violent crimes in South Africa.