Average age for mothers across countries

The general correlation seems to be that the more developed the country the later women are becoming first time mothers.

Average age for first time mothers across countries

Nerd jokes: Scientist Physicist and Mathematician

Questioner: "Approximate "

Physicist: ""
Computer Scientist: ""
Mathematician: "Explain what you mean by 'approximate'"

Optical illusion: Can the brain be tricked?

Do you want to see if in the image below the outer circles can rotate? Focus on the center and move your head back and forth: