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Valery pour your car spend four hundred thirty seven days on the mir space station apparently with no ill effects on his health. the next destination for human spaceflight is likely to be mars using today's technology a manned mission there would take around three years and the potential risks of that adventure are still being investigated. one recent study has shown that a journey to mars might be bad for your health doctors found that after as little as three months exposed to microgravity astronauts had changes to their brain structure. if you have a science question go to our website and s...

Athletes. >> we're interested in what makes them on a near row biological level. le we didn't know what happens in the brains. the. >> the study enrolled 23 top ranked memory athletes. there was also a control group. the brains of all three groups have been examined through a series of mris. the. >> you can do a lot of different things. we looked at the brain structure, by size and different regions did not differ. them we looked at activation during tasks. we were surprised to see that the brain structure actually doesn't differ that much from normal people. so there isn't any single connecti...

>> the study enrolled 23 top ranked memory athletes, including boris. he helped design a regimen for the participants to train like the athletes do for 30 minutes a day for six weeks. there was also a control group. the brains of all three groups were then examined through a series of mris. >> you can do a lot of different things. first we looked at the brain structure. we could see by size of brain did not differ from control group. we looked at activation during tasks, which part of the brain gets more active when you use such memory technique. we were surprised that the brain's structure ac...

Disease as their male counterparts. one reason? age. on average, women live longer than men with a life expectancy of 81 compared to about 76 for men. with alzheimer's starting to spike for both sexes at 75. researchers say it is more likely more complicated than that. and they are racing to see if genetics, hormones and differences in brain structure could all play a role. >> there's also still mysteries in the brain. that's why more federal funding for research is needed to unlock the mysteries of this disease. >> reporter: women also bear another burden, they are much more likely to be care...

Look at the impact on brain development. what do you make of that age of 21 being the cut off? >> during development, lots of things happen to the brain. it's unfortunate that we don't have a definitive time at which we know the brain is finished developing and it's clear you can do whatever you'd like. while the brain is developing the frontal cortex is the last to come online. and to be fully developed. the most important for things like regulating impulsivity, we already know that lots of emerging adults have difficulties making good decisions or not being impulsive. if you add to that diff...