Which of the operating systems listed below is not proprietary?

Another name for addicting games.com

On early television stations, what typically filled the screen from around 11pm until 6am? test dummies test patterns tests testing colors

You wanted to look up information about alzheimer's, but you were unsure if it was spelled "alsheimer's" or "alzheimer's." which advanced search strategy would be useful? a) a boolean search b) using a wild card in your search c) trying different search engines d) doing a search for "alsheimer's not alzheimer's" asap. ill give brainlist.