Questions with the keyword 'human behaviour'

• why are some people left or right handed and why not both by sdkfz 222 to Rob Comments: (No comments so far )
• Why do we yawn? by 349anta39 to Rob, Ceri Comments: (No comments so far )
• Are you born smart and if so, why? by NotSally to Ceri, Marikka, Matt, Rob, Sally Comments: (No comments so far )