In the ocean depths on this planet, ecosystems centered around deep ocean thermal vents, using "chemosynthesis". IF someone had suggested the reality of that just a few decades ago, they would have been told it was IMPOSSIBLE, by the scientific community.

Then the FIRST deep ocean thermal vent ecosystem was discovered in the late 1970's or early 1980's .

Doo-Doo happens....

A thread on lighting one's own flatulence would have more value than any discussion of 'big foot'.

Houston, We Have IGNITION !!!

FWIW: ALSO REMEMBER that flying MANNED rocket-propelled vehicles into Earth orbit - NOT to mention to the MOON - was once considered IMPOSSIBLE.

Even as far, in some circles, as the late 1950's....