Hi,
Scientists found an amoeba in a California hot spring that can reproduce at 63°C. That is the highest temperature at which reproduction has been observed in a eukaryote—a group that includes animals, plants, fungi, and many single-celled organisms.
I kept coming back to one detail: the amoeba can survive a brief exposure to 70°C, but it does not reproduce there. Surviving a condition for a few minutes and building a life in it are different achievements. If we call both “living at 70°C,” we lose the most useful part of the finding.
The discovery gives researchers a new place to look for the limits of complex cells. It does not tell us that complex life could thrive anywhere hot. This amoeba still needs water, food, and the right surrounding conditions.
That is the question I took into this week’s article: how hot can complex life actually get—and what counts as evidence that it lives there?
See you next Sunday,
Aman
10AM Publishing
Research source: NASA’s account of the study