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.
The hardest metal is chromium.Actually, hardness is determined by the resistance of the material to be scratched . The hardest material is diamond,then comes corundum etc.This hardness is measured on Mohs scale.People get confused that Osmium has the better claim, but actually it is the densest .