If you are close to ovulation, EC may not be able to prevent pregnancy if you wait 5 days. Therefore, the best thing to do is take EC as soon as you can get it. A thorough and up-to-date academic review of the medical and social science literature on emergency contraception is available here .
Employer Identification Number - EIN. A unique identification number that is assigned to a business entity so that they can easily be identified by the Internal Revenue Service. The Employer Identification Number is commonly used by employers for the purpose of reporting taxes.
An employer identification number, or EIN, is a nine-digit number similar to a Social Security number. It is assigned to a business entity by the IRS. Business entities that are required to file various tax returns use their EIN the same way an individual uses his or her Social Security number.