Every day approximately 50 new fortune seekers travel north on Canada's Highway 63 to the tar sands of Alberta, to join what may be the world's last great oil rush. The two-lane all-weather highway starts about 100 miles north of the provincial capital, Edmonton, and ends at Fort McMurray, a sprawling city hastily carved out of swampy groves of spruce. The road was originally built in the 1970s to connect a marginal and experimental source of heavy oil with the rest of the country. It has since become a continental artery to a modern-day Klondike that has made Canada the number-one supplier of oil to the United States. That's right -- Canada.