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...systems...Minerals and the crystalline state: 1 Introducing crystals - Three distinct types of crystal, each of which is a different mineral, can be seen in the granite shown in Figure 1: shiny black biotite mica; cloudy white feldspar and translucent grey quartz. Figure 1 A close-up of a piece of granite, 7 cm across, showing interlocking, intergrown crystals of several...

...systems are being formed. In this badged course, Astronomy with an online telescope, you will learn about some of these celestial objects and have the opportunity to take spectacular images using the remotely-operated COAST telescope facility in Tenerife. You will find out how telescopes and astronomical imaging equipment works, and learn how to get the most out of your...

...system of social hierarchy. When Facebook reinstated Preetha's account, her full name appeared on her profile, caste name and all. Some castes are more vulnerable than others. My South Asian colleagues have explained to me that a move like this can give your enemies license to treat you as badly as they like, with impunity. Similarly, police are unlikely to respond to a...