Liquid printing is virtually ubiquitous thanks to inkjets, but the materials can only be so sluggish before it stops working. What if you wanted to print a biological material, or even liquid metal? That might happen soon. Harvard researchers have developed a technique that uses acoustic levitation to print droplets of materials that wouldn't normally be so accommodating, including metal and honey. The approach uses a subwavelength acoustic resonator to create a sound field that pulls substances from the printer nozzle at over 100G -- even some of the most viscous materials can't resist that tug. You can control the size of the droplets using the amplitude of the soundwaves, and place them anywhere you like.