Making the world better, one answer at a time. a superbug is a micro-organism that is resistant to most anti-biotics. the superbugs in recent history are imune to all anti-biotics,except one.
Both electronic and paper versions of Series I savings bonds are purchased at face value and earn interest until they are redeemed or reach maturity. You must hold Series I bonds for at least 12 months before redeeming them. Series I savings bonds will continue to earn interest for up to 30 years. They will cease paying interest once they have matured.
Rates & Terms. 1  Series EE bonds issued May 2005 and after earn a fixed rate of interest. 2  EE bonds purchased between May 1997 and April 30, 2005, earn a variable rate of interest. 3  Interest is added to an EE bond monthly and paid when you cash the bond. 4  Paper bonds were sold at half the face value; i.e., you paid $25 for a $50 bond.