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• Before electricity, people experienced bright, full-spectrum days of sunlight and dark nights. We slept in a different way than we do now.
• Everything changed when electric lighting was invented in the latter part of the 19th century. Since then there has been an ever-increasing ass...

3.What foods stain your teeth? Foods that are bright or bold in color are the most likely to stain your teeth. Red pasta sauces, berries such as blueberries and raspberries, and bright curries all can contribute to teeth staining.

4.What drinks cause teeth staining?...

All humans partake in gossip in some form. Everyone talks about other people. One study found that male participants spent 55% of conversation time and female participants 67% conversation time on socially relevant topics.

People like to think of gossip as the same as mali...