This is an excellent site for articles on different Areas of Knowledge and would make a great resource for essay preparation and also to generate a topic for your presentations. We're not sure whether the website has been updated since June 2008. If not, then be advised to scan the various pages and make the most of the material before the website is taken off the internet.
Some examples of the articles collated on the site are are as follows:
'Science Cannot Provide all the Answers'
'Scientology on Trial'
'Do all languages have a common ancestor?'
'How does homeopathy work?'
Go and have a look and use the resources efficiently, making sure that you get the full bibliographic information so that you can reference it appropriately.