On the definition of Guinea pigs When I watched a YouTube video endorsed by a researcher from  Microsoft Research, Cambridge, he often said the word &quot;guinea pigs.&quot; The video title is something like &quot;How to write a great research paper.&quot;  I wonder what it does it mean. In other words,  I'm asking about the definition of the guinea pig. I guess that it's a kind of advice from a person who read the manuscript. Thank you in advance for your advice.
The strict meaning of &quot;guinea pig&quot; is a certain rather cute rodent; see Guinea pig at Wikipedia. The metaphorical meaning in the context of research is an animal or person on which or whom experiments are performed.