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 southernmost species (the emperor and the Adelie penguins) live in Antarctica. The northernmost species (the Galapagos penguin) lives in the Galapagos Islands. The other species live along the Antarctic Peninsula, the coastal areas of South America, Australia, New Zealand and South Africa.he southernmost species (the emperor and the Adelie penguins) live in Antarctica. The northernmost species (the Galapagos penguin) lives in the Galapagos Islands. The other species live along the Antarctic Peninsula, the coastal areas of South America, Australia, New Zealand and South Africa.