Memories help us make sense of who we are but how do they work?

Stephania Brunetti remembers the day her younger sister was born like it was yesterday.

“I was at my aunty’s house, and she had answered the phone that was on the wall,” says the 45-year-old from Melbourne.

“She was so excited. She kept screaming out, ‘It’s a girl! It’s a girl!’ I was two.”

Some…