Twin study suggests rationality and intelligence share the same genetic roots - the study suggests that being irrational, or making illogical choices, might simply be another way of measuring lower intelligence.

[u/mvea]

https://www.psypost.org/twin-study-suggests-rationality-and-intelligence-share-the-same-genetic-roots/

[u/boooooooooo_cowboys]

Real life decisions are a lot different than making hypothetical decisions about simple and emotionally neutral subjects on a test. 

Conflicting information, unpleasant consequences of the decision, and feelings about the other people involved can all easily steer people away from the making the most rational decision. 

[u/lasagnaman → u/boooooooooo_cowboys]

That's not what the word rationality means in this context.