Even DARPA understands that its futuristic bubble shield can be penetrated given the right circumstances, and when it does, the soldier behind it is going to need some serious healing. In a hurry. In the entity's newest budget, there's $6.5 million tucked away "for the creation of a scaffold-free tissue engineering platform, which would allow the construction of large, complex tissues in vitro and in vivo." As you well know, this type of mad science has been around for quite some time, and now it looks as if DARPA is read