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...becomes stable under its own weight. You will also realise that some heavy weights, both stones and timber, had to be shifted – which called for ropes, pulleys, levers …. And day by day the project had to be supervised, or kept on track, by an engineer who understood both what to do and how to do it. Evidently this engineer did it rather well: the result is still...

...become predominant, called Firmicutes and Bacteroidetes, which form about 90% of the gut microbiota (Arumugam, 2011). Figure 4 shows the distribution of the most common bacterial groups found in microbiomes around the body. You may notice that the different parts of the GI tract contain different proportions of the bacteria. [Described image] Figure 4 Distribution of...

...become blurred by the development of thermoplastic elastomers (TPEs). Moreover, all polymers, irrespective of their nature, can be reinforced by a very wide range of fillers to produce composite materials. [Figure 3] Figure 3 Classification of polymers by property Another way of classifying polymers is in terms of their form or function, varying from additives to other...

...becoming an astronaut in 1987. She flew as a mission specialist on STS-47 in 1992 and STS-60 in 1994, and was the payload commander on STS-85 in 1997. In July 1999, she transferred to the Marshall Space Flight Center, where she became Director of Flight Projects. Dr. Mae C. Jemison, the first African-American woman in space, was born on October 17, 1956 in Decatur,...

...become filthier and filthier, until at last it threatens to produce still deadlier maladies than cesspools in every street would have done. In fact, in our reforming zeal, we have merely changed a hundred thousand small cesspools for one moster one. We undertook only a part of the necessary work, and that not the most important part. When the old Board of Health resolved...