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.
Cash in any EE savings bond that is older than 30 years old. EE savings bonds only earn interest for 30 years; if you happen to be sitting on a bond that is older than 30 years, it doesn't make much sense to keep it invested in an interest-less bond, so cash it in.