Ecology and the environment, space, world citizenship, global government, geography, big history, bizarre connections, speculations and a fair amount of miscellany.
Thursday, June 22, 2006
The Beauty of Evolution
There's a lovely post on Pharyngula about the evolutionary connection between fish gills and our thyroid glands. Fish use their gills not just for gas exchange but also to control the concentration of salts in their bodies. So what does a fish do when it finds itself on land and needs to regulate calcium in its blood? Read the post to find out!