Cyanotoxin which is why they are usually green or blue. Cyanobacteria are found almost everywhere; in oceans, lakes and rivers as well as on land. They flourish in Arctic and Antarctic lakes, hotsprings and wastewater treatment plants. They even inhabit the fur of polar bears, to which they impart a greenish tinge. Cyanobacteria produce potent toxins, but they also produce helpful bioactive compounds, including substances with antitumour, antiviral, anticancer, antibiotic and antifungal activity, UV protectants and specific inhibitors of enzymes. Cyanotoxins are often implicated in what are commonly called "red tides" or "harmful algal blooms". Lakes and oceans contain many single-celled
Great Lakes Twa Great Lakes Twa The Great Lakes Twa, also known as "Batwa", "Abatwa" or "Ge-Sera", are a pygmy people who are generally assumed to be the oldest surviving population of the Great Lakes region of central Africa, though currently they live as a Bantu caste. Current populations are found in the states of Rwanda, Burundi, Uganda and the eastern portion of the Democratic Republic of Congo. In 2000 they numbered approximately 80,000 people, making them a significant minority group in these countries. Apart from anthropological literature, the term "Twa" generally refers to the Twa of the Great Lakes region. There are