Given a list of cities and the distances between each pair of cities, what is the shortest possible route that visits each city exactly once and returns to the original city? This is the travelling salesman problem, and questions like these are the specialty of computer science.
Computer science is the study of computers and their uses. As personalized computers and mobile phones become popular, cloud services and databases collect more and more of our information, making internet security a major issue. Computer science has therefore become one of the most significant areas of science, utilized by schools, corporations... READ MORE
Our cells communicate using a molecular postal system; the blood is the postal service and hormones are the letters. Insulin is one of the most important hormones, carrying messages that describe the amount of sugar that is available from moment to moment in the blood. Insulin, made in the pancreas and added to the bloodstream when sugar levels are high, spreads throughout the body and binds to insulin receptors on the surface of liver, muscle, and fat cells. Insulin tells these organs to take out sugar from the blood and store it in the form of fat or glycogen... READ MORE