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Except by that exact source, mass shootings with rifles are under reported and the deadliest mass shootings were done with semi automatic rifles.
“Since 1982, there has been a known total 65 mass shootings involving rifles, mostly semi-automatics. This figure is underreported though, as it excludes the multiple semi-automatic (and fully automatic) rifles used in the 2017 Las Vegas Strip massacre – the worst mass shooting in U.S. history, killing 58 and wounding 546. In fact, semi-automatic rifles were featured in four of the five deadliest mass shootings, being used in the Orlando nightclub massacre, Sandy Hook Elementary massacre and Texas First Baptist Church massacre.”
It’s a bit of both. Infants have more neural plasticity as others have mentioned, so when using the same learning strategy babies are going to learn better. That said, adults have a lot more knowledge and experience and are able to make connections to a lot more things; so there are methods aimed at teaching adults that are more effective than methods used to teach babies.