Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating.
Emperor penguins owe their scientific name (Aptenodytes forsteri) to their discoverer, the first natural scientist to reach Antarctica, the German Johann Reinhold Forster. Forster came to Antarctica in 1770, on Captain James Cook's ship, and saved Cook's life during the voyage.
Meet those well-loved, well-dressed flightless birds in THE WORLD OF PENGUINS. We all have an image of penguins gliding on ice at the South Pole â images that come from childhood. But contrary to popular belief penguins live beyond Antarctica, and can be found in New Zealand, southern Africa, and South America. While some species have adapted to life in regions that reach 100 degrees below zero others are comfortable in temperatures 100 degrees above.