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...system known as a solera. Effectively the barrels are placed on top of each other and the young sherry added to the top barrels. Every so often wine is moved from one barrel to a lower barrel, but only small amounts at a time. Effectively matured wine is tapped from the bottom barrel as newer wine moves from higher to lower barrels. The process is carefully controlled so...

...systems, including the human eye and how it adapts to dark conditions such as in astronomical observing. On learning this, one of the pupils remarked: "We did this in biology!" Imaging celestial objects Participants in Astronomy with an online telescope will learn to find their way around the night sky, find out how telescopes and optical instruments work, and understand...

...system. The most remarkable feature of the brain is the cerebral cortex, which gives the human brain (and that of many other species) its characteristic bumpy appearance. The brain can be divided into two hemispheres and the cerebral cortex of each of these can be divided into four distinct lobes – each associated with different functions. Underneath the cerebral cortex...