For students in the primary and intermediate grades, going to Google to search for research information or images could end badly whether at home or at school; a student could misspell a word and land on an image or page which they didn't intend or they could see something more suitable for teenagers to read or see.
There are five free search engines that you can use with your students in the classroom as a teacher or at home as a parent, which are great resources to keep your students safe while navigating and searching online.
SafeSearchKids - http://www.safesearchkids.com/
KidRex - http://www.kidrex.org/
InfoTopia - http://www.infotopia.info/
GoogleJunior - http://www.googlejunior.com
SearchyPants - http://searchypants.com/