It was a big year for autism research! One major advancement was the identification of biologically distinct subtypes of autism. A study by Princeton and the Simons Foundation pinpointed four subtypes by analyzing over 5,000 children, which could really help with more precise diagnoses and care.

Researchers are also making strides in understanding the genetic and environmental factors involved in autism, including identifying 33 X-linked variants. Plus, there's growing knowledge about how autism overlaps with conditions like ADHD, and how it can present differently depending on sex. You can check out Autism Speaks or the Autism Science Foundation websites for more details.