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The exact reason is unknown but there is numerous theories. The 3 main theories are explained in this video and are involved with Duel processing,a malfunction in The nervous system and a false sense of familiarity because some elements are familiar and you just haven't realised it

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Have you ever had the eerie feeling that you are reliving a past experience? Click here to see more videos: http://www.m301.me/lifenoggin Life Noggin is a weekly animated educational series. Whether it's science, pop culture, history or art, we explore it all and have a ton of fun doing it. Follow Us!

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In fish that change gender only parts of the reproductive organs mature at first. The fish lives as a male or a female for awhile. when the fish reaches a certain age, or its mate dies those initial reproductive organs wither away and other reproductive organs mature, so that the fish becomes the opposite sex. This change is caused by hormones or chemical messengers in the blood.  A fish has both testicular and ovarian tissue and it is matter of just encouraging one of those tissues to develop. They use mostly vision and sound signals to communicate to hypothalamus in areas of the brain. This communicates with the pituitary gland which is a little gland right below the brain. This releases hormones into the blood and communicate to the gonads. This causes the testicles to absorb and ovaries to develop. This completely reverses the behavior so they change from a male to a female fish.

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Blood in your veins has very little oxygen and is a dark red color that looks almost blue when covered by your skin. Your arteries have bright red blood because it has a lot of oxygen in it that is being carried throughout your body to be used by tissues

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consists of at least two trillion galaxies and It is estimated that the diameter of the observable universe is about 28.5 gigaparsecs (93 billion light-years.

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Fill the 5 gallon jug and pour into the 3 gallon until full so you have 2 gallons in the 5 gallon jug then put that into the container and repeat to get 4 gallons

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Jugs Problem from the movie Die Hard 3 including problem and solution. The solution's not explained well in the video. It's explained better here : http://www.math.tamu.edu/~dallen/hollywood/diehard/diehard.htm

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Inspired by class salt experiment

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Today I am going to show you how to make rainbow colored flames out of household materials. Whats your favorite color??? Lithium from batteries burns red, Calcium chloride in Damp-Rid burns orange, Sodium in table salt burns yellow, boron in roach killer burns green, methanol burns blue all by itself, and potassium in No-salt burns purple.

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= SPEED OF SOUND
340.29 m / s

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The Columbia was travelling at 24.1 mach
re-entering the Atmosphere

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NASA Gives Graphic Details of Columbia Deaths

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RARE! Space shuttle Columbia Explosion footage

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On February 1st, 2003, the space shuttle Columbia disintegrated during its re-entry into the atmosphere. The seven astronauts were killed. 82 seconds after the launch of shuttle (STS-107), a sizable piece of foam struck the leading edge of Columbia's left wing, at a speed between 650 and 950 km/h, making a hole in the protective tiles made of reinforced carbon-carbon (RCC), close to the landing gear area.

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Balancing chemical equations, step by step example. Learn how to balance chemical equations and more at http://MathMeeting.com

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See how the New 2010 Volvo XC60 is designed to react to an accident and prevent occupant injury. Learn more about the XC60 at http://www.volvocars.com/us/XC60

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the crumple zone is the part of a motor vehicle that is designed to crumple in a crash to absorb most of the force

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momentum is the quantity of motion of a moving body , measured as a product of its mass and velocity