Logic (from the Greek logos, which has a variety of meanings including word, thought, idea, argument, account, reason or principle) is the study of reasoning, or the study of the principles and criteria of valid inference and demonstration.
Go to Google Trends (see resources below). Google Trends is a great way to find most popular searched words on Google. It lists the top 100 searched words and is frequently updated throughout the day. You can click on any of the search words and find out more information about it. Go to Yahoo Buzz.
You can get up to 100 most searched keywords on each eBay category, or search if any keyword is searched on eBay. For example: Under eBay category Baby, the most popular searches are currently: baby monitor, baby swing, bib, bassinet, diapers, car seat.