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.
Final Maturity. Series EE savings bond don't stop earning interest as soon as they double their face value. Rather, they have a final maturity of 30 years. This means that the bond will continue earning interest for 30 years after you bought it, regardless of whether it doubles in value after 20 years with a special Treasury payment or earlier.