jacquesm is right, there's no actual scientific breakthrough here. We already know glutaraldehyde does a good job of preserving synaptic structure, that's why we have used it to fix brains for electron microscopy analysis for roughly a century. I guess it's cool that you can freeze a glut-fixed brain and then unfreeze it and that won't have a dramatic effect on the structure. I'd be interested to know how quantitative their analysis was. Absence of evidence (of deformed synapses) is not evidence of absence. But anyways the synaptic ultrastructure probably isn't everything. It's necessary but not sufficient.