Even before I began high school, I can remember suffering regularly from hunger pains. These were not the normal pains of a growing boy, nor were they the result of poverty. We always had enough food, even though we were poor. Several years later at Fort Meade, Maryland, 1 developed intense stomach pains again. They were probably precipitated by stress in anticipation of combat. Fort Meade was ...

Living systems are perhaps the most fascinating examples of chemistry in action. Molecules assemble into biomachinery that can carry out complex tasks, making life possible. But how did it all begin? This question can be tackled from a geological perspective by surveying the possible conditions under which key biomolecules might have emerged on early Earth. Alternatively, a systems-biology appr...

Software agents have become very popular in the last six or so years. They have been used successfully to filter information, match people with similar interests and automate repetitive behavior. More recently, the capabilities of agents have been applied to electronic commerce, promising a revolution in the way we conduct transactions, whether business-to-business, business-to-consumer, or con...

Biochemistry textbooks depict mitochondria as oxygen-dependent organelles, but many mitochondria can produce ATP without using any oxygen. In fact, several other types of mitochondria exist and they occur in highly diverse groups of eukaryotes - protists as well as metazoans - and possess an often overlooked diversity of pathways to deal with the electrons resulting from carbohydrate oxidation....

species of chameleon, Furcifer labordi, in Madagascar that spends most of its life as an egg. in Madagascar and the American Museum of Natural History in New York, have found a chameleon with a remarkable lifestyle and report the results in the latest issue of the Proceedings of the National Academy of Sciences (published online). Although there are almost limitless theoretical combinations of ...

YouTube has been the Internet success story of 2006. However, when subjected to conventional usability evaluation it appears to fail miserably. With this and other social Web services, the purpose of the user is fun, uncertainty, engagement and selfexpression. Web2.0 has turned the passive ‘user’ into an active producer of content and shaper of the ultimate user experience. This more playful, m...