Sea serpents were superstition and myth until they caught a few of them. Unknown (and sometimes thought-to-be-extinct) fish are now known.
Sailors always knew about them.
But people drew pictures of them as huge dragons and 100-foot squid (Oops, those are real too) and other fictitious beasts. Sailors were ridiculed for believing in sea monsters.
:asian:
Chi is just a metaphor until you open your eyes and apply the term "chi" to everyday experience.
The Chinese always knew about it (as did many other cultures in different ways and with different words).
But people turned it into some psychic power through movies and frauds doing tricks. So people who recognize they use it every day, and can use it effectively in martial arts are written off as "misunderstanding" physics.
:soapbox:
So without assigning the Chi article in Martial Talk Magazine for homework, here's a hint -- the Chinese language is not abstract, except to those who are unfamiliar with the culture and language. The words themselves are rarely metaphorical, and are only used that way as phrases, such as "beating the heavenly drum" for tapping the cerebellum.
The problem is that the understanding of breath is different from culture to culture, and therefore the things we can do with it are limited by that understanding -- that frame of reference for understanding the world. Chinese scientific process is not Western, and that is why they achieve different results and abilities.
Chi is a whole body experience, and we experience it all the time without putting a label on it or being aware of it. Those of us that do can do things that aint in the physics book. Not usually like the stuff from movies mind you, but interesting feats from various documentaries.
What I've found is that people who desperately try to pick it apart with physics don't understand physics any more than chi. Science has been an interest of mine since I was four years old, and no one has been able to explain chi properly from that frame of reference -- it's like trying to eat melted ice cream with a fork.
And that's why people limited to Western thought will never get it, and consider the rest of us fools.