Two Zoltáns, Gócza and Kollin are maintaining a superbly good webiste about UX-myths, uxmyths.com.
Given the excellent quality of the site, they list common mis-beliefs people have regarding websites and they thoroughly debunk them with references to actual measured information.
Just by reading their list we learn, that
Go see all the studies, research and details in their site.
And thank you for your work Mr. Gócza and Mr. Kollin. Thanks for sharing with all of us.