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.
Siesta Beach in Sarasota was named Dr. Beach's top U.S. beach in 2011. Siesta Beach in Sarasota boasts that it has the finest and whitest sand in the world, and I cannot argue with this claim, Leatherman said in 2011. The powdery sand is nearly pure quartz crystal.