Birds of a feather . . .
Driving home each day I pass a power plant close to my house that usually has a large steam plume rising several hundred feet into the sky this time of year. If there is no wind it goes vertically straight up over a thousand feet into the air and on days with a light breeze it angles up into the air until the steam plume evaporates. The hot air continues to rise even without a visible plume to show you where it is going. The strange and sometimes funny thing that many of us driving by each day notice is the large flock of birds that are flying in circles upon the rising warm air. When I used to fly hang gliders when I was young it is called thermaling and within the hot air rising you make tight turns so you can stay in and ride to the top sometimes just under the bottom of the clouds. It was a great feeling going up to the top of a thermal and then leaving that one to fly over to another rising air mass to start circling all over again. Some flights I may...