I think that it registers what you search for and gives you ads based on that. I am always getting the banners for CDH and for Wedding cakes and I highly doubt its a coincidence.

It is sad that our entire health care system is run as a business. What really ticks me off is all these medication ads you see on TV. You should not go to your doctor and say I need THIS drug. You should go to the doctor and say I have THESE SYMPTOMS and let the doctor prescribe something. Grrrr.... it all gets to me. Especially since symptoms are often so broad.