1.   For exam-ple, an emergency or operating room is not the best environment for monitoring subtle variations in heartbeats.

2.   In my audio record of the dive, I run out of adjectives to describe the subtle variations in the lava morphologies.

3.   As an actor, Fred Dalton Thompson offered subtle variations of tough, serious and glowering Senator Fred.

4.   At this lab, the scientists will look for subtle genetic variations between the more-violent winners and the more-submissive losers.

5.   A photo of a cloud-filled sky, however, has many subtle variations in blues and whites.

6.   Central to the sleuthing is a hunt for subtle variations in the DNA of the suspect anthrax that might distinguish it.

7.   Changeable barometric pressure, inauspicious lunar phases and subtle variations in the magnetosphere conspired to limit my catch for the week to two fish.

8.   Corals record changes in local rainfall and temperature as subtle variations in the ratio of two isotopes of oxygen incorporated in their calcium carbonate skeletons.

9.   Even subtle variations in these chemicals from one person to the next could theoretically mean the difference between an Ozzie Nelson and a Hugh Hefner.

10.   If the Web were working perfectly for everyone, we might not need to contemplate subtle new variations.