Then there were other times when he needed my support (holding my hand in the hall, working through his quest for order and identifying unknown objects in the classroom). (myplaytherapypage.com)
Young children tend to explore unknown objects by tasting them. (childinjuryfirm.com)
A mysterious star that erratically dims by nearly a quarter as a swarm of unknown objects passes in front of it — leading to speculations that artificial objects could be orbiting the star — continues to refuse to give up its secrets after a search for laser pulses from the system turned up empty. (astronomynow.com)