But at the microlevel it consists of an unimaginable number of atoms connected by springy chemical bonds, all jiggling around at a rate that even our fastest supercomputer might envy.
Unlike normal chromosomes, polytenes are visible in a microscope even when cell division is not taking place.
The building of the railway in this notable beauty spot roused the great Victorian writer John Ruskin to fury.
While it was not in the national interest to disclose details of the exhaustive plans made to enable the railway organisations to meet possible eventualities, certain information was made public in July indicating some of the activities in which the railways were directly concerned and the steps they were taking.
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