“Like Eartself,” I remarked.

    “Precisely,” he agreed.

    t Yelloone apply to park employees as muco visitors. Doss got a in  e one nig activity knoting”—s publicize it, not all tone are dangerously . Some are extremely agreeable to lie in, and it  of some of to e at nig  to do so. Fooliso take a flas, o a scalding vent beloo tream t to leap over earlier. t of took a running jump. In fact, it tream at all. It  three survived.

    I t about t morning as I made a brief call, on my  of t aplace called Emerald Pool, in t ime to take me t I t I oug least to  it, for Emerald Pool is a oricsite.

    In 1965, a eam of biologists named tudy trip,  rimmed t for life. to tually t extremop could live in er t o bemucoo  or acid or co bear life. Emerald Pool, remarkably,  at least types of living ticus as t congenial. It  notemperatures of 50°C (122°F), but ers nearly t .

    For almost ty years, one of teria, ticus,remained a laboratory curiosity until a scientist in California named Kary B. Mullis realizedt -resistant enzymes  could be used to create a bit of cion, s to generate lots of DNA from verysmall amounts—as little as a single molecule in ideal conditions. It’s a kind of geneticpocopying, and it became t genetic science, from academicstudies to police forensic  ry in 1993.

    Means  ures of 80°C (176°F) or more. torganism found so far, according to Frances As in Life at tremes, is Pyrolobusfumarii, ure can reac for life is t to be about 120°C (248°F),