Four years later, general relativity made Einstein himself a celebrity. If gravity curves space, he had realized early on, a light beam passing near a massive object (say, the sun) would be deflected from its course. That deflection would shift the apparent position of the source of the light (say, a distant star).
Median sunscreen price was US$1.70 per 10 g. Assuming that standard sunscreen application recommendations (2 mg/cm 2) were followed, the median cost to the family varied from $178.20 per week (if children were 2-year-olds) to $238.40 per week (if children were 10-year-olds).ltraviolet (UV) radiation is a known carcinogen and sun-protection strategies, including sunscreen use, have long been advocated. However, many individuals fail to use sunscreen adequately. Sunscreen cost may contribute to poor compliance.
1 If your skin would normally burn after 10 minutes in the sun, applying an SPF 15 sunscreen would allow you to stay in the sun without burning for approximately 150 minutes (a factor of 15 times longer). 2  This is a rough estimate that depends on skin type, intensity of sunlight and amount of sunscreen used.un Protection Factor Explained. In Brief. SPF measures sunscreen protection from UVB rays, the kind that cause sunburn and contribute to skin cancer. SPF does not measure how well a sunscreen will protect from UVA rays, which are also damaging and dangerous. Dermatologists recommend using a SPF15 or SPF30 sunscreen.