NASA (WKOW)--A big announcement by NASA today is changing the way scientists look at the very building blocks of life.
And, it could put us one step closer to discovering life on other planets.
We've always looked for alien life that matches our own biology, our own DNA .
Now scientists believe that phosphorous, found in every living thing, is not necessarily the only sign of life.
Today's announcement comes after a two-year study near Yosemite National Park which found a bug will grow when the toxic chemical arsenic essentially replaces phosphorous.
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