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.
The Manchineel tree, native to the Western Hemisphere, is known as the most poisonous tree in the world. In places where it grows â Florida, the Caribbean and the Bahamas â the manchineel is often marked with a red band to warn passersby not to get too near it.The tree is poisonous on so many levels that if you ever spot one, it is better you stay at least a few yards away from it.t was supposedly named â manzanita de la muerte â (little apple of death) by Christopher Columbus. But it might just be the least dangerous part of the tree. The manchineelâs milky white sap is incredibly caustic and poisonous as well â even a drop could cause skin blisters, dermatitis, swelling or burns.