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.
Whitest beach in the world. Hyams in Australia. This beach on the east coast of Australia holds the Record Guinness for having the whitest sand in the world. But I think that this organisation has forgotten to include in this World Record that it also has the noisiest sand.