- A paper on “topology optimization for structures incorporating preloads (tensegrity)” was shared: http://www.sciencedirect.com/science/article/pii/S0020768305004932.  
- Discussion explored whether a sufficiently powerful phased-array of ultrasound transducers could create a true hoverboard; current lab systems have only levitated a few kilograms.  
- A referenced tweet from Bruce Drinkwater plots the acoustic power required to levitate a Mini Cooper or a human, giving concrete numbers to the feasibility debate.  
- A Physical Review Letters supplemental link was posted showing “Chladni Patterns in a Liquid at Microscale,” illustrating microscale acoustic pattern formation.  
- An off-hand remark claimed that a black market for PhD dissertations “theoretically” exists, highlighting underground knowledge-transfer channels.