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 Guinness Book of Records reports Hyams Beach as having the whitest sand in the world. The village is bordered by Jervis Bay National Park to the north and Booderee National Park and Botanic Gardens to the south which gives Hyams Beach a 'natural bush' feel with an abundance of native plants, animals and birdlife.