(CNN) - You've probably heard cockroaches can survive a nuclear bomb.
While that’s not scientifically proven, scientists at Purdue University discovered German cockroaches are becoming resistant to insecticides.
Even more horrifying: They can become cross-resistant to chemicals to which they haven’t even been exposed.
They pass those immunities onto their offspring, creating new generations of evolved super-roaches.
Researchers worry this will some day make it difficult - or impossible - to control the bugs with chemicals alone.
They say the best thing to do is combine preventative measures like sanitation and physical methods like traps with insecticides.