January 11, 2011. 1  According to Education Next, teachers retire, on average, at around the age of 58. AARP reports that 33 percent of all beginning teachers leave the teaching profession within three years of beginning their careers, but the majority of teachers continue teaching and can reap retirement benefits later in life.
Deep-sea anglerfish, hatchetfish, and lantern fish are among the best-known luminescent fishes. In most such fishes, luminescence is produced intracellularly; the light is emitted by special cells called photocytes. The anatomical structure of the luminous organs of many fishes is similar to that of squids.
The African Butterflyfish Pantodon buchholzi is a unique and fascinating freshwater fish from Africa. It is also known as the Freshwater Butterflyfish. The Butterfly fish was Introduced to European aquarists in 1905 and is the only member of its species, and its family. Butterfly fish has a flat head and back that is a light brown or greenish color with a silver sheen and has dark markings on the fins and underside. The large pectoral fins of the Freshwater Butterflyfish are widespread and it uses them to glide over short distances.