If you’re talking about a graphene sheet 1 meter by 1 meter by 1 atom, it’s not stopping a bullet. I’m not sure it’d stop a *sneeze*.
No idea if you’d be able to feel it, but you can (apparently) [see it.](https://www.reddit.com/r/interestingasfuck/comments/jbmtcc/visible_1atom_thick_graphene_1cmx1cmx1atom/)
Without some sort of backing material, a 1-atom thick sheet would probably curl into a roll.
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