A Japanese study shows that riding on two wheels makes you smarter. Thank you Vespa.
It might be telling that the test was conducted with riders in their 40s and 50s. That would tend to screen out the young morons who weave in and out of highway traffic on their ballburners wearing nothing but sunglasses. So either you are smart enough not to do that in the first place and make it to 40 or natural selection cleans things up and you don’t make it to 40. That doesn’t appear to be part of the study, however.