OP here. If you saw that on a guide page, that's an experimental script we're trying to rescale image containers to the viewport. A window resize would trigger a refresh. It's not clear if we'll keep the behavior. If you make an account, there is a profile option to turn it off (as well as the always-on hover over notes).

It would probably make sense to disable that effect on mobile--the constant address bar disappearing and reappearing mobile browsers do triggers a lot of refreshing. Maybe just listen for orientation-change events instead?

Very cool site otherwise, keep it up!

Great tip, thanks. It's been added to our To-Dos. We're reworking that functionality in general so it may be a little while before the fix is included, especially with all of us on deck for the Maker Faire this weekend.