sian beilock is a psychology professor at the university of chicago.as some tips for keeping stress from getting the better of us. >> that's right. here's a common scenario -- it's the final seconds of a big soccer game. you've got the ball, and can score the winning point. it's a pretty easy kick, but you actually miss. the blame may actually be due to your brain. i call it paralysis by analysis. instead of just letting your body react naturally, stress causes you to overthink the situation, and this can throw you off your stride at a critical moment. >> so what can we do to overcome an attack of the nerves? >> well, here's how to fight the stress. simple thing le singing a songs yostep up the ball focusg thepot athe backf the net wherwant tba tlano thorverthinkg everst of >>'ll rtainlha to th t thanks, . beilk. >> you're welcome! blue whales areig, so is the appetite. a new study of the giant creature found they take in almost half a million calories, not in one day -- in one mouthful. that's like eating a thousand fried-fish sandwiches in a single s

sian beilock says video games can actually be good for your brain. >> it's true.t's start with early childhood first. there's research that shows that some types of video games may help develop motor skills. and then there are studies with college students. according to the data, playing video games actually helps improve memory and attention. >> so does that mean the more games i play, the better? >> no. you can't, unfortunately, swap video games for doing your homework. that's because the benefits of playing games max out after a certain point. like everything else, all things are best in moderation. >> thanks, dr. beilock. >> you're welcome. oft... and totally irresistible. your lip butter? likewise. new revlon® colorburst™ lip butter. a hydrating buttery balm for baby soft lips in 20 shiny colors. >> long before there were digital cameras, taking pictures was an incredibly complex procedure. stephen tells us about the inventor who changed that. his contributions made such an impact on our world, his home is now a museum. >> photography had been invented long b