# Brian Greene on Reddit (u/briangreeneauthor)

Part of Scientists on Reddit, researched with Autumn (https://www.autumn.ai) from public sources. Updated 2026-11-07. Interactive version: https://www.autumn.ai/resources/scientists-on-reddit/brian-greene

Brian Greene: Theoretical physicist, author of The Elegant Universe.

- Reddit account: [u/briangreeneauthor](https://www.reddit.com/user/briangreeneauthor/) (AMA only)
- How we know it's theirs: [The 2020 r/IAmA AMA, posted from this account](https://www.reddit.com/r/IAmA/comments/f8vvdo/)
- Where they post, in the records we retrieved: r/IAmA (36), r/askscience (1)
- Known activity in the posts we found: 2020 to 2020
- Wikipedia: https://en.wikipedia.org/wiki/Brian_Greene

## Moments

### u/briangreeneauthor in r/IAmA, Feb 24, 2020 · Explains things

Replying to a redditor:

> What do you think are the biggest questions about the universe right now? Are there any limitations to what humans are capable of knowing?

> From my perspective, the biggest questions are (a) the nature of spacetime and (b) the nature of consciousness. Regarding limits to human knowledge--there could well be things we are unable to understand. Take dogs. They're smart creatures but they seemingly don't know much about quantum mechanics. They, seemingly, don't have the brain power. Perhaps, then, we humans too don't have the brain power to grasp certain deep truths about reality.

Full thread: https://www.reddit.com/r/IAmA/comments/f8vvdo/comment/finv6my/ · 462 points as of Nov 7, 2026

### u/briangreeneauthor in r/IAmA, Feb 24, 2020 · Explains things

Replying to a redditor:

> Do you think that the question of "consciousness" is ever possible to be explained via physics in the same way we describe other phenomenon? What other kind of reasoning or understanding could there be?

> I do. I hold to a so-called physicalist perspective that imagines consciousness/mind not requiring any "spark" or "force" or "substance" that stands outside the very same types of ingredients that make up my desk or coffee cup. Some recoil at this possibility, thinking it diminishes mind. I have a different view. I consider it WONDROUS that ordinary particles governed by the usual forces of nature, when configured appropriately, can think and feel and explore. To me, that is the point--matter and laws accomplish spectacular things.

Full thread: https://www.reddit.com/r/IAmA/comments/f8vvdo/comment/finwzg1/ · 370 points as of Nov 7, 2026