A new biomaterial could improve knee-cartilage repair surgery.
Single-celled organisms could be "trained" to deliver drugs.
New software tracks a stolen laptop without tracking its owner.
A new device could help with deep brain stimulation.
Free-piston engines could be used to generate electricity as efficiently as, and less expensively than, fuel cells.
Robotic helicopters learn complex tricks by analyzing demos.
A company says 3-D nanoparticles boost the efficiency of water purification.
A lensless imaging system finds and recognizes the shadows of T cells and bacteria.