Most women knows what is SPF, which stands for Sun Protection Factor. But what is it really means and how is it measured?

The number indicates how long it takes before sunburn occurs. Some volunteers are needed to do the experiments where they are exposed to light spectrum which mimic the noontime sun.
Some volunteers will wear sunscreen […]

On the way to work today, I saw a car banged into a divider in the middle of the highway and the car behind was too late to stop and rammed into the first car. I guess it is due to speeding during rainy day and the road is very slippery.

And my friend in another […]