Fold your arms to be smarter

According to this article:

The mere act of folding your arms increases perseverance and activates an unconscious desire to succeed, new research shows.

University students randomly assigned to sit with their arms crossed spent more time on an impossible-to-solve anagram, or word scramble, in one experiment, and came up with more correct solutions to solvable anagrams in another than those told to sit with their hands on their thighs.

Though that could just mean that putting your hands on your thighs makes you dumber.