The following are some links to online sites which will help you find sources to answer your research questions:
Note: If you find an academic article or research paper, you often just need to read the abstract to get the main ideas rather than the whole paper.
ACS Publishing -(online Magazine Search)
Britannica.com - Encyclopedia with basic information on scientific topics
Google Scholar - is a free web search engine that indexes the texts of scholarly literature for many disciplines. Includes most peer-reviewed online journals of Europe and America's largest scholarly publishers, plus scholarly books and other non-peer reviewed journals.
Livescience.com - Information about space, animals, health, environment and more
Popular Mechanics (science magazine)
Physorg.com - Physics-based website
Science Daily (science magazine)
Scientific American (science magazine)
SQU Library - Search e-resources as well as the library collection
Onelook.com -A special dictionary website where you can search multiple dictionaries for words (and their meanings) using special search operations given below.