A physician referral will be required for MRI and CT scans. They simply present their insurance card to any of the 1,000 alternative therapists and specialists in the network and receive an average discount of 25% on visits; physician referral is not required.
Strongest Metal in the World. The top 3 contenders for the title of the strongest metal in the world are tungsten, osmium and titanium - however, the top spot doesn't belong to any one of them. The following article explains why and how. There is quite a debate regarding which metal should be crowned as the strongest metal in the world. The controversy is due to the fact that based upon the various physical properties (discussed later in this article), no single metal can be considered as scoring a perfect ten when all parameters are considered.
Titanium is a very strong metal. It is chemical element number 22 on the periodic table. Its symbol is Ti. Titanium alloys are used in aerospace engineering to make very strong and light parts of airplanes. It does not corrode, not even in sea water and chlorine. However, it can burn at high temperatures, and titanium dust is extremely flammable. It has 22 electrons, 22 protons and 26 neutrons.