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.
1 Bonds issued from May 1995 to May 2003 have a term of 17 years. 2  Bonds issued since June 2003 have a term of 20 years.  Series EE bonds are designed as long term investments. They earn interest for a maximum period of 30 years after they are issued. Thus, a Series EE bond with a 20 year term will continue earning interest for 10 years after it matures.