[ male announcer ] when your favorite food starts a fight, fight back fast with tums. heartburn relief that neutralizes acid on contact and goes to work in seconds. ♪ tum, tum tum tum tums! welcome back. e liz beth has a rundown of the year's big breakthroughs. >> reporter: it's been a thrilling year in scientific exploration. let's look at some of this year's top stories. is there life on mars? we haven't seen any martian, but thanks to the curiosity rovers, we know that life could have kpigsed on the red planet. meanwhile, interest is soaring to send humans there. more than 200,000 people signed
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