If you have already had your post-Thanksgiving nap, you might be interested to know that the molecule tryptophan may have another use besides making you nod off. Researchers from Oxford University say that the chemical precursor to serotonin may also induce trust. Volunteers were given a drink that depleted their tryptophan. Although the final results are not in from the experiments, they found that when they reduced it, the chemical also lowered “the reward value of cooperating.” We just wonder why every family Thanksgiving feast we have ever attended has ended in a tussle.

(Happy Turkey Day!)