Scientists said Thursday that they had trained a bacterium to eat and grow on a diet of arsenic, in place of phosphorus — one of six elements considered essential for life — opening up the possibility that organisms could exist elsewhere in the universe or even here on Earth using biochemical powers we have not yet dared to dream about.

The choice of the word "trained," is very important here. Might we humans have been "trained" in similar fashion?  To read the rest of the article, click here.