Interesting about the digit ratio. As a counter example my ring and index are approximately the same length on both hands, left hand index is only slightly smaller. I've never been diagnosed with autism though (my friend who used to work very closely with autistic kids has suggested that I might be slightly in the spectrum because some characteristics but that's about it).

Could be a pattern. Could be a pattern that doesn't actually exist. I think we need more samples (I'd imagine some selection bias on HN)