check this out, their idea (maybe I should say our idea)

http://www.ece.purdue.edu/~hongtan/Hongtan-pub/PDFfiles/C24_Ertan_wearable1998.pdf

Looks like not just MIT......even UC Berkley and Columbia U students are also doing our ****...

http://csdl.computer.org/comp/proceedings/iswc/2003/2034/00/20340069abs.htm