He does not propose an explanation for how this class of black holes formed. (sciencedaily.com)
Interestingly, a surprising number of proposed explanations for orchid diversity failed the new test. (sciencedaily.com)
The National Science Education Standards (NSES) define inquiry as «the diverse ways in which scientists study the natural world and propose explanations based on the evidence derived from their work» (NRC, 1996, p. 23). (citejournal.org)