Radical Circus

One of our radicals posted this link, about a theory questioning gravity. Definitely radical!

Remarkable New Theory Says There's No Gravity, No Dark Matter, and Einstein Was Wrong A theoretical physicist proposes a new way to think about gravity and dark matter.

Shared by one of our radicals.
"What I want my alphabet to convey to the reader is the sensation that children feel in front of books they cannot yet understand. I used it to describe analytically an imaginary world and give a coherent framework."
Is this radical?

Look Inside the Extremely Rare Codex Seraphinianus, the Weirdest Encyclopedia Ever

Definition of radical?