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>> how cute is that. there's a study that finds laughter helps make your brain work better. they watched a funny video and afterwards performed memory tasks. laughter sends endorphins to your brain and boosts your immune system. >> laugh you will have a better memory. who knew it. coming up bio fuel is being pushed as a clean alternative to gasoline. turns out it is not the environmental effect everyone was talking about. s there is a shocking reason why we want to tell you about this. guy: hey captain obvious, watch this!

>> you are officially trained. too often though we have to talk on the phone, while typing an e-mail, listening to a co-worker all kinds of stuff. >> sorry, what? multitasking may help us juggle everything, but what is it doing to our brains? abc's t.j. winick found some answers. >> reporter: peter spencer, like a lot of us, believes he is an expert multitasker. >> my feeling is i can focus on whatever issues, i have to deal with many things simultaneously. >> reporter: researchers put him to the test. driving a simulator doing math problems and memorizing words. >> is eight times four plus tw...