On this day in 1946 the first bikini hit the beach, giving sunbathers lots more skin to tan and girl-watchers lots more girl to watch. But years of all-over sunburns have taught us that beautiful tans lead to premature aging and serious skin problems. Even though they're 93-million miles away, the sun's powerful rays cause skin to age 10 times faster than they would normally, and greatly increase chances for skin cancer. While there's no safe way to tan, you can protect yourself out in the sun by wearing a sunscreen, SPF 15, or higher. Use it year round, rain or shine, because UV rays pass through clouds and through clothes too. T-shirts give only 2 percent of the protection needed. SPF stands for "sun protection factor." These numbers, multiplied by 10, tell how many minutes it's good for. SPF 15 lasts 150 minutes, SPF 30 300 minutes, and so on. So decide how long you'll be on the beach wearing or watching bikinis and plan accordingly. And that's the On The House tip for today.