External gills usually contains muscle tissue, and may be moved by the animal as a free appendage, in order to stir up stagnant water. The stalk is lined by many thinly walled filaments (fimbriae), containing the majority of blood vessels used in gas exchange. Animals usually have one external gill originating on each gill arch (except the hyoid), which leads to there being three pairs of external gills in salamanders, and four in the gilled larvae of lungfish. External gills External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside
Pint of Science alike. We thought that, if people want to come to labs to meet scientists, why not bring scientists to people? This was the birth of Pint of Science." After running the first festival in May 2013 in three cities, Pint of Science received many emails from people wanting to join the festival - both around the UK and the rest of the world. There is no fixed format and freedom is given to the local organisers for how events are run. Rather than a series of formal talks, Pint of Science aims to recreate the buzz of popular music festivals,