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.
The emperor penguin (Aptenodytes forsteri) is the species that lives in the coldest habitat of all since some Antarctic zones reach a temperature as cold as -40Âº or -60Âº C. To withstand the effects of this harsh climate, their feathers, and their abundant body fat are their best resources.