Psychologia wzrostu – Śmiech nie jest nabyty lecz wrodzony
Psychologia wzrostu – British scientists have proved that laughter is not something acquired, but innate. With the help of ultrasound was recorded children in the uteri. The first facial movements have been observed in the second trimester, and all elements detecting a laugh approx. 30 weeks. It was thus negated one of the existing theory of psychological development.