Good old dictionary.com have a thing called word of the day and of course everyday that have a new word which is not really used in normal converstation.

For example todays word is Fecund which means;
1. Capable of producing offspring or vegetation; fruitful; prolific.
2. Intellectually productive or inventive.
For Example: For 21 years after the birth of the Prince of Wales, the fecund royal couple produced children at the rate of two every three years — eight boys and six girls in all

So the challenge is to some how today is use that word in a normal converstation with out it seeming out of place.