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...simple cooking analogy to help explain genetic mutations and their potential consequences in the body. While some genetic changes have little or no effect, others can cause problems with a person’s health and development. This is known as a genetic disorder. However, while our genes determine a lot about our characteristics, it is important to remember that our...

...simple introduction to wavelengths and looks back to the discovery of electromagnetism and the invention of radio. To demonstrate just how vital waves are, the two captains turn off their modern communication tools and try traditional methods of keeping in touch. In addition, two bonus video tracks explore Newton's laws of motion and Einstein’s special theory of...

...simple: chimpanzees have culture. Are animals born cultured? This discovery started the “culture wars”, largely between animal behaviourists and anthropologists, a debate which raised the question of when we could talk about cultural variations in animal behaviour. A scientific approach is to make predictions we can challenge with experiments and observations. For...

...simple, and high production rates are achieved using carousels and automation. Energy requirement is about half that of conventional sand casting. Steel castings have been shown to be 15–20% cheaper than comparable sand castings. Cost of gravity die castings is comparable with other casting processes (see diagram). Typical products include cylinder heads, wheel hubs and...