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Laughter than we know. by human right at least in the brain it's just so. when a rat loves it's not audible to the human ear the rat emits a series of high frequency chuckles in the range of fifty kilo heads to hear a rattle off uses an ultrasound detector tests we can stimulate their. stimulating specific parts of the brain. and every place you stimuli that you get a rat laughter which is kind of should you choose the animal likes it the animal will turn on the stimulation themselves so now we know it's a positive emotion. from. jason how this animal charge for a good response has actually be...

Black boxes, what do you use the bluefin for? >> the bluefin vehicles have been used for over 15 years. originally they were used for ocean graphic research. very first crews were done in an articca. used in the artic to study global climate change. used for alternative energy, offshore wind farms. >> it seems that we have lost the ceo. anyway, we thank him. australian searchers are calling the pings the most promising lead yet. we have heard that one before. are we really any closer to finding the missing plane? joining us underwater search expert coal leenel keller. hank whitmore and air saf...

The human ear. also, mitt romney caused a national case of whiplash on the car industry. after he lost to john mccain in the republican primary in 2008 after he dropped out, the only thing he made further headlines for that year as him coming out as super against the bail out. wants to take a lot of credit for the government bailout of the auto industry, the bail out which he opposed. >> the auto companies needed to go through bankruptcy before government help. that's what the president did. that was the right course that i argued for from the beginning. i'll take a lot of credit for the fac...

I had no samples of trayvon martin's voice to compare against. >> you need to compare audio to audio. ed, what method did you reach to if come to the same conclusion. >> i listened to the 911 recordings and listened critical listening skills that i have developed over the last 28 years of my career. the voice is like a symphony and used my skills to determine what i have already declared. >> ed, you are using an old-fashioned piano tuner's method, the human ear, highly tuned and trained for distinctions. tom, the test you have run, would they be admissible in court? >> yes. i have already test...

You don't have a way of determining whether it was trayvon martin. >> that's correct. i had no samples of trayvon martin's voice to compare against. >> you need to compare audio to audio. what ed, what method did you reach to if come to the same conclusion. >> i listened to the 911 recordings and listened critical listening skills that i have developed over the last 28 years of my career. the voice is like a symphony and used my skills to determine what i have already declared. >> ed, you are using an old-fashioned piano tuner's method, the human ear, highly tuned and trained for distinctions....