JAMIE STRANGE: They used natural products—that's right, Mr Brownlee. Zinc oxide paste was around for thousands of years, even before it was cool in the 1980s. Synthetic sunscreens were first used in 1928, so that's when the mass synthetic production of sunscreen came, in 1928. In fact, in World War II, the US military used sunscreen in the Pacific. In 1974, the sun protection factor, which has been alluded to in the previous member's speech—SPF—was introduced. That's 1974. Water-resistant sunscreens were introduced in 1977. 