Does anyone know what happen to these threads

There was lots of posting going on in these threads but for some reason the threads seem dead. Where did all the members go? I see they have not log in here for a long time.

Where are the members going?These where the threads.

The medical progress is coming to brick wall.

http://www.scienceforums.net/topic/57526-the-medical-progress-is-coming-to-brick-wall/page__p__610044__fromsearch__1#entry610044

Psychology basics that people keep talking to me about

http://www.scienceforums.net/topic/58300-psychology-basics-that-people-keep-talking-to-me-about/page__p__615381__fromsearch__1#entry615381

Cure for Cancer?

http://www.scienceforums.net/topic/51782-cure-for-cancer/page__p__564199__fromsearch__1#entry564199

U.S. debt crisis weighs on markets at midday

http://www.scienceforums.net/topic/58752-us-debt-crisis-weighs-on-markets-at-midday/page__p__618364__fromsearch__1#entry618364