A while ago a NASA funded study claimed that they could get bacteria to incorporate arsenic into their DNA.
Life forms based on different elements than life on earth have been speculated about in science fiction for a long time, the most prominent, hypothetical example is probably silicon-based instead of carbon-based life. Now, arsenic and phosphorus are in the same group in the periodic table like carbon and silicon are. This is the first study I know of that claims that life based on different elements is really possible.
Did they conclusively show that life forms based on arsenic-containing DNA are possible, or is this an overhyped and exagerrated conclusion?