As doctors warn it can cause a dangerous reaction with a host of common drugs... 1  Researchers warn that grapefruit reacts with many medicines. 2  The fruit can cause devastating side-effects from stomach bleeding to kidney problems. 3  Doctors say the public is ignorant to the dangers and putting themselves needlessly at risk.
According to the definition of the question (based on light reflection and not light emission), a well-polished mirror is the the whitest substance on earth. The main reflection layer is usually made out of silver.
White Sand Beaches in Florida. Northwest Florida has some of the purest whitest sand anywhere in the state. Its dazzling crystals are nearly pure quartz resulting in soft fluffy sand that is a pleasure to walk on. I'll never forget my first steps onto the white sand beach at St. Andrew's State Park near Panama City Beach. 1  The sand was so pure and so soft. I dug my feet into it scooped it up with my hands and marveled at its purity. Only a few tiny flecks of dark minerals could be seen in the nearly pure white sand.