so i've come up with some mnemonic devices to help me learn your nas. hello, a "penny" saved a "penny" earned. oh, that's 'cause fedex ground helps you save money. that'sht, penny. do you know ours? heavens to betsy. dwayne the bathtub. magic wanda. ah! what's mine? uh, you're a dan fool. oh. it's just a device, dan. you c take it personally. yeah, i suppose. [ male announcer ] we uerstand. you need a partner whhelps you save. fedex ground. >> shannon: just getting to the gym to stay in shape can take a lot of work for some but imagine trying to stay fit in zero gravity up in space. nasa is trying to design new equipment to keep astronauts