The sun's ultraviolet (UV) radiation is both the major cause of skin cancer and the best source of vitamin D. In Australia, we need to balance the risk of skin cancer from too much sun exposure with maintaining adequate vitamin D levels. Sensible sun protection does not put people at risk of vitamin D deficiency.
1 In 1819, Maine applied for statehood. Then a compromise developed: Maine could join as a free state to balance out Missouri joining as a slave state.  By 1820, the compromise had been realized. First, Missouri and Maine would be admitted to the Union, one as slave and one as free. In addition, the remaining territories would be divided into free and slave at the 36Â°30' parallel. This compromise became viewed as sacred by both sides.
The Missouri Compromise was intended to address the issue of balance of power between free and slave states; it was successful for a while because it maintained the balance by allowing one free state and one slave state to join the Union at the same time.