How long have sharks been in the ocean?

How long have sharks been in the ocean?

Sharks have swum in the oceans for almost 450 million years. But longevity is only part of the story. That extra few million years of evolution have enabled many shark species to develop some extraordinary abilities as perfect predators.

What were George Washington’s teeth made of?

Over the years, Washington wore several sets of false teeth. Even though many people today believe that these teeth were made out of wood, there is no proof that he ever had wooden teeth. His dentures were made of many things. They were often a combination of human teeth, animal teeth, and ivory.

What year were colored tvs invented?

RCA demonstrated its “all-electronic” color system for the first time on October 9th, 1951. The test was also broadcast on WNBT, and because RCA’s system was compatible with existing black and white television sets, viewers were able to watch the demonstration (in black and white, of course).

Why does the Earth only see one side of the moon?

Only one side of the Moon is visible from Earth because the Moon rotates about its spin axis at the same rate that the Moon orbits the Earth, a situation known as synchronous rotation or tidal locking.

What is the longest punt in NFL history?

The record for longest punt in NFL history is held by Steve O’neal of the New York Jets with a 98-yard kick in 1969. The ball was snapped on the one yard line, but O’neal made a booming kick, which bounced and rolled all the way to the 1 yard line.

What percentage of Icelanders believe in elves?

Though Jónsdóttir’s belief in elves may sound extreme, it is fairly common for Icelanders to at least entertain the possibility of their existence. In one 1998 survey, 54.4 percent of Icelanders said they believed in the existence of elves.

What was the first city to reach a population of one million?

The first city to reach a population of 1 million people was Rome, Italy in 133 B.C. London, England reached the mark in 1810 and New York City, USA made it in 1875. Today, there are over 300 cities in the world that boast a population in excess of 1 million.

What gland is responsible for regulating metabolism?

The thyroid gland regulates the body’s metabolism, while parathyroid glands regulate calcium levels and have no effect on metabolism.