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...communicate directly with their immediate neighbour through gap junctions (Figure 3a). Communication via gap junctions partially bypasses the signalling model we have outlined above in Figure 2. Gap junctions connect the cytoplasm of neighbouring cells via protein channels, which allow the passage of ions and small molecules (such as amino acids) between them (as an...

...communicate their presence to other possible inhabitants of our galaxy. One of the most exciting recent developments in astronomy has been the detection of planetary systems around other stars. Many astronomers believe firm evidence for the presence of extraterrestrial life, either on another planet in our Solar System or orbiting a different star, will be found during...

...community with various qualifications relative to age. These graphs can be analysed separately. But it is also possible to compare the information from them, as the following observations indicate: At the age of 49, about 10% of the men have qualifications above A-level, about 30% have some other qualification, about 65% have no qualifications. Notice that the total...