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Until the first half of the 20th century, clothing was made of natural materials wool, silk, leather, cotton, hemp, flax. There was nothing else that could be used, and the properties of these materials were pretty fixed. At that time, structure and bonding in molecules were imperfectly understood. For one thing, it was generally believed that there was an upper limit to the size of molecules. Whilst studying the chemistry of rubber, the German chemist Hermann Staudinger (1881 1965) (photo, right) measured very high molecular masses and in 1920 he proposed the idea of small molecules joining to form very long chains, in other words, the concept of polymerisation, though this was a very unpopular opinion. By the 1930s, more and more experimental data supported this view, though it was not until 1953 that Staudinger was awarded the Nobel Prize for Chemistry "for his discoveries in the field of macromolecular chemistry".No. Ferrets are not rats nor are they related to rats. Rats are members of the Rodentia family, while ferrets are members of the Mustelidae family. One way to see the difference between rats and ferrets is to look at their teeth. Ferrets have canines like dogs and cats (though not related to them), while rats have incisors. Ferrets do have incisors, but they are very tiny and stay the same size throughout their lives. Rats' incisors are constantly growing and get trimmed down by the rat gnawing on wood and other things. Ferrets' diet also is immensely different from rats'. Rats eat nuts, seeds, and fruits while ferrets are obligate carnivores and must eat a high protein and high fat meat/protein based diet. There are obvious physical and behavioral differences as well. Rats are much smaller than ferrets. Rats, as well as most rodents, are nocturnal, meaning they are active mainly at night. Ferrets are neither nocturnal nor diurnal (active during the day); they are active during both day and night hours.
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