Heritability tells us how much variation in a population tracks with inherited differences. It does not tell us what caused autism in one child. That distinction is the whole of what the National Autistic Society got wrong.

Most of the attention in PANS and PANDAS goes on the infection that came first. But onset keeps clustering around seven, the age adrenarche begins, and that timing may matter too.

Ferritin is the number everyone looks at when a child's iron is low. But it is not only a measure of iron stores, and thyroid hormone is one of the things that can change it.

L-theanine can be wonderfully calming for some children and surprisingly activating for others. Why the difference may tell us something important about the nervous system underneath.