Although it has already taken nearly four decades to get this far in building the Internet, some university researchers with the federal government's blessing want to <A HREF="http://news.yahoo.com/s/ap/20070413/ap_on_hi_te/rebuilding_the_internet">scrap all that and start over.</A>

The idea may seem unthinkable, even absurd, but many believe a "clean slate" approach is the only way to truly address security, mobility and other challenges that have cropped up.