The Federal Trade Commission (FTC) is warning people about an upsurge in phone calls from scammers posing as employees of the National Institutes of Health (NIH) in which the scammers inform their targeted victims that they have been selected to receive a $14,000 grant from the NIH.  All they need to do is pay a processing fee through an iTunes card or a Green Dot money card.
This is a total scam and even if your Caller ID makes it appear that the call is from the NIH, your Caller ID can be tricked through a technique called “spoofing” to look like the call is from the NIH when it is not.
TIPS
You will never be called by the government to tell you that you have been awarded a grant for which you have not applied.  In addition, government grants do not charge a processing fee of any kind.  You can find out more information about federal grant providing agencies at http://www.grants.gov, however it is important to remember that grants are not given for personal purposes, but only for public projects.