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 Fastest Living Thing On The Planet. You may think the fastest living thing on Earth is a Cheetah, or Peregrine which can reach speeds of 68-75 mph. Actually the fastest living thing on Earth is the spores from fungi found on feces of herbivores. The spore is called Pilobolus which accelerates 0-45 mph in the first millimeter of flight.