Girls enjoy complex social interaction. Their verbal skills - and their delight in using them - develop earlier than boys'.

The Bible is a study guide for social interaction.

Social media allows me to pick my times for social interaction.

We don't see a lot of models for male social interaction. There's sports and barn raisings.

A placebo-controlled, double-blind, randomised trial of boys with autism found that two to three servings of cruciferous vegetables a day improves social interaction, abnormal behaviour and verbal communication - within a matter of weeks.

How then did it work out, this? How did one judge people, think of them? How did one add up this and that and conclude that it was liking one felt, or disliking?