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Extra info for Why Don't Penguins' Feet Freeze? And 114 Other Questions
Mark Feldman Northland, New Zealand Studies have shown that there is no correlation between environmental temperature and suffering from colds. The origin of the old wives’ tale that predicts colds, ’flu or pneumonia after being exposed to cold temperatures is the short period of fever that precedes the distinctive symptoms of these illnesses. These periods of fever make the patient feel cold and shivery. Shortly after developing other symptoms, the patient then associates the illness with having ‘caught cold’.
Laurie North London, UK Your previous correspondent suggested that the green colour is caused by a combination of golden-yellow Staphylococcus aureus and blue Pseudomonas pyocyanea. This is a rather tenacious belief. While the eighth edition of Bergey’s Manual of Determinative Bacteriology (Williams & Wilkins, Baltimore, 1974) still held P. pyocyanea ‘commonly isolated from wound, burn and urinary tract infections’ to be the causative agent of ‘blue pus’, the cause of the green colour of pus or nasal mucus is more general.
It is interesting that this larger amount of cerebral cortex does not necessarily correspond to a larger number of cortical nerve cells. It turns out that these are larger and more widely spaced in large animals. One reason for this is that the ratio of glia to neurons is considerably greater in these large vertebrates. As a result, the cerebral cortex – a laminar structure – needs to become folded to contain the number of neurons that smaller animals can afford to have in a non-folded cortex. E.
Why Don't Penguins' Feet Freeze? And 114 Other Questions by Mick O’Hare (Editor)