Questions with the keyword 'human'

• (I don’t know if I already asked this’s because i don’t know how this site works) I was watching a video and it was by to Nancy Comments: (So far, one comment )
• when will you try this experiment on a human being. by to Emma Comments: (No comments so far )
• Do you study animal’s sight as well as humans? by to Michael Comments: (No comments so far )