Posts Tagged ‘sunscreen’
July 12th, 2020 by Dr. Hannah Sivak
That suntan that used to be fashionable (and still is in some circles) is a signal that the UV in the sunlight has damaged your DNA. Nothing to celebrate, right? Ultraviolet light is classified into three categories: UVA (315 to 400 nm), which causes tanning, UVB (medium wave, 280 to 315 nm), which causes sunburn, and UVC (short wave, germicidal, 100 to 280 nm), which is filtered out by the atmosphere and does not reach us. Incidentally, the ozone (O3) layer of the atmosphere absorbs 97–99% of the UV in the range 200 nm to 315 nm, which is why the destruction of the ozone layer by some chemicals is…
January 12th, 2020 by Dr. Hannah Sivak
What is the precautionary principle? Here it is, in Wikipedia. “The precautionary principle (or precautionary approach) is a strategy for approaching issues of potential harm when extensive scientific knowledge on the matter is lacking. It emphasizes caution, pausing and review before leaping into new innovations that may prove disastrous. ” Although this sounds so much like philosophy (it is), it can be applied to daily life. In the skin care industry, novelty is sold as a virtue, when in reality, it is anything but. Older ingredients have accumulated more information about possible side effects and decades of use show that they are safe’ if they are not, they are banned…