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Left. jenna: right, exactly. researchers looked a the more than 3300 people ages 16 to 44, studying things like concentration and multitasking and the ability to shift focus from immediate to long-term issues and they found slowerintd many starting to decline in the mid 20s. brian russell a psychologist, joins us right now. why mid 20s? why can't we get a couple more years out of it, dr. russell? >> well there is good news and bad news. what we know certain kinds of cells do sort of reach their peak in terms of their duplication and replication, sort of their peak development relatively early ...

Fast as children do. they say the pill boosts chemicals in our brain making them more elastic. doctors say it is harderç for adults to learn new things because the brain reaches peak development. >> move over john travolta. there is a new king of "saturday night fever." ♪ ♪ >> check out big john, the grandpa showing off his move to the bee gees. he got his name because of his height. he is six-four. >> in order to become a u.s. citizen immigrants have to take an exam testing their knowledge of america. >> jesseç watters goes to