1. Use a middle initial, or even MULTIPLE initials. A study had people rate a paper on Einstein where the name of the writer was either listed as "David Clark" . . . "David F. Clark" . . . "David F.P. Clark" . . . or "David F.P.R. Clark." And when they looked at the results, the name with the most initials got the best ratings.
2. Use graphs at work, or at school. A study at Cornell had people read two versions of a report about a new cold medication. When the report didn't have a graph, 67% of people said they believed the information. With a graph, it jumped to 96%.
3. Drink anything other than alcohol. There's something called "imbibing idiot bias," where just holding a drink makes you seem less intelligent, even if you're dead sober.
4. Speak more expressively. Meaning don't be boring and monotone. People tend to think you're smarter when you can vary the speed, volume, and pitch of your voice. And your energy level should fluctuate too.
(Forbes)