Just in terms of the SPF rating, most of the sunscreens in the 1970s were around an SPF rating of two or lower—very, very light. We didn't know much about sunscreens and we didn't know much about skin cancer back then. But, certainly, things have changed. If we move forward to today's society, dermatologists—and I tread carefully because I know we've got three doctors in the row in front of me here—recommend SPF of 30 or above, and an SPF of 30 blocks 90 percent of the sun's UV rays. 