The phrase "technology demonstration" refers to a process where a new technology or invention is presented or shown to others, to help them understand and believe in its capabilities and potential benefits. Full definition
First used as teaching tools and for technology demonstrations, their utility to perform more complex science duties and serve as the backbone of commercial services is gaining traction. (scientificamerican.com)
Live technology demonstrations with these tools were a regular part of the online class. (citejournal.org)
Regarding (a), mitochondrial transplant appears to be possible via an infusion, per a recent technology demonstration. (fightaging.org)