Is ADHD part of the spectrum diagnosis of ASD?

A recent study examining some people who lost an autism diagnosis (and were possibly reclassified) reinvigorates the idea that attention deficit hyperactivity disorder may be on the autism spectrum.  It shouldn’t be part of a valid ASD diagnosis, but there may be some symptoms of ASD that overlap with ADHD.  Also, a new editorial emphasizes that while new discoveries are important and exciting, what happens to make them useful for people outside a research study takes a lot of work, time and money.