Through an interview with Dr. Sloof Lirpa, "April Fools" spelled backward, Search Engine Watch uncovers some important issues in search engine marketing, from keyword stuffing to duplicate content canonical issues. Lirpa works at the Sloof Lirpa Center for the Study of Long Tail Profitability in Washington, D.C. Greg Jarboe tells us the center has 459 employees, including 458 with PhDs and 1 normal guy.