The Madness/random
A fragment of the Garden of Remembering
At least one professor has concluded there are 3 species of jellyfish that are immortal, and says their immortality may hold the key to immortality for human beings.
Any sufficiently advanced science is indistinguishable from magic. Ultimately the determining feature is how well it's understood in practice, or in retrospect. If a thousand years later nobody still understands it and has made no progress toward understanding it, maybe it is magic... or maybe they're just idiots.