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.
Female emperor penguins, Aptenodytes forsteri, lay a single egg, which is then incubated by the male in a special pouch on top of the feet. Incubation lasts 62-67 days during which time the male fasts and the female returns to the sea to forage.