A team of researchers who just finished analyzing 20 years of data from locales around Los Angeles said that particulate matter less than 2.5 micrometers in diameter poses the greatest risk of causing early death as it can penetrate deep into the lungs and sometimes even enter the bloodstream. Such particles are often found in smoke, vehicle…

In 1986, Lake Nyos, a volcanic lake in Cameroon, released a huge amount of carbon dioxide gas, killing over 1,700 people in the surrounding area. This case study, developed for use in a limnology or aquatic biology course, explores that event, introducing students to concepts relating to lake formation, thermal stratification, and dissolved gases.…