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Describes what a canker sore is, where canker sores develop and how long canker sores usually last.

Imagine a self-powering cell phone that never needs to be charged because it converts sound waves produced by the user into the energy it needs to keep running. It's not as far-fetched as it may seem.

A persistent pollutant, tributyltin, has effects on gene activity in a wide range of animal species at concentrations of parts per billion. Tributyl tin and its chemical relatives bind to nuclear receptors that in turn activate genes influencing the formation of fat storage cells. This and other evidence suggests a possible role for tributyl tin in the obesity epidemic. The compound has been shown to affect gene activity at extremely low concentrations.

In order to investigate the greenhouse gas effect in Europe, one has to measure the concentrations of CO2 from fossil fuels at different places all over the continent. This could be done with 14C tests of air samples, but the same types of measurements can also be carried out on plants that have absorbed CO2. To that end one would need plant material that is known to come from a specific region and also know which year it grew in.

Stopping anti-platelet medications prior to a surgical procedure places a patient at greater risk of permanent disability or death. The probability of a patient bleeding depends on the over-the-counter and/or prescribed drug or combinations of drugs.

Many computing luminaries, such as Steve Jobs or Bill Gates, have an early experience in common -- an engaging experience in middle School or high school that sparked an excitement for learning everything they could about computers. Today, many young people are surrounded by computing at home and in School, and some of them will likely find a similar passion that will lead them to push tomorrow's frontiers in computer science.

A new study identifies six different mosses from the Tyrolean Iceman's alimentary tract.

The basic molecules that make up all living things have a predetermined chirality or "handedness," similar to the way people are right or left handed. This chirality has a profound influence on the chemistry and molecular interactions of living organisms. Scientists have discovered a way to induce this handedness in pre-biological molecules.