Mechanical anti-biotics

Among many of the new nanotechnology advances is an antibiotic that operates mechanically:

peptide nanotubes that kill bacteria by punching holes in the bacteria's membrane.

Because these select out the bacteria cells but don't puncture the host cell, developing resistance to the antibiotic is much less likely. There are other advances, too: high-strength metals (by a factor of 10 to 50!), metallic cells that clean up contaminating chemicals, and nano-motors.