What are some signals of autism?

At any age

1. Loss of previously acquired speech, babbling or social skills.

2. Avoidance of eye contact.

3. Persistent preference for solitude.

4. Difficulty understanding other people's feelings.

5. Delayed language development.

6. Persistent repetition of words or phrases (echolalia)

7. Resistance to minor changes in routine or surroundings.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

a.   mass number from atomic number