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...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...

...becomes so strong that not even light (perhaps the fastest thing in the universe) is fast enough to get out. This is a black hole. Beautiful curves Starlight and black holes are fun, but what does this have to do with day-to-day life on Earth? Have you ever used the Global Positioning System (GPS)? It’s a common feature of mobile phones today, but it relies entirely on...