> Tell me about the small mammal BRAINS that you have cryopreserved and revived with any evidence of retention of memories or prior training. Nobody has revive

> Tell me about the small mammal BRAINS that you have cryopreserved and revived with any evidence of retention of memories or prior training. Nobody has revived a small mammal brain because unlike kidneys, we don't yet have the technology to transplant brains. Brains are easier to perfuse with cryoprotectant than kidneys, so they tend to be preserved better. Cryoprotectants seem to be tolerated well by neurons. It is currently possible to cryopreserve & thaw rat hippocampal slices while keeping structure intact and over 90% of cells viable: http://www.21cm.com/pdfs/hippo_published.pdf http://www.21cm.com/pdfs/hippo_published.pdf > Tell me about any nervous systems at all which you have successfully preserved and revived. Doesn't have to be a mammal, I would settle for an insect. Tell me about those please. People have cryopreserved & thawed nematodes with an 84% survival rate: https://www.ncbi.nlm.nih.gov/pubmed/23995406 https://www.ncbi.nlm.nih.gov/pubmed/23995406 The cryopreservation of many kinds of insects (usually in larval or embryonic form) is doable as well. Some of these organisms have thousands of neurons. The whole point of cryonics is to take advantage of the difference in technology required for preservation versus revival. Saying, "Cryonics is snake oil because revival doesn't work yet." is demanding evidence that can't yet exist even in the case that cryonics works.