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.
Emperor Penguins Facts - Aptenodytes forsteri Emperor penguins are one of the classic penguin species that people imagine when they hear the name. Along with King Penguins and Adelie penguins, they are representative of the whole group.