What makes glass or water transparent (what is the scientific explanation for this)? Do you think it would be scientifically possible for a man to become invisible, or transparent?

Are there forces around us that are invisible, for example, magnetism? Are there aspects of matter that are ‘invisible’ or not visible to the naked eye?

Would you like to become invisible? What advantages and disadvantages do you foresee, if you did?

How would you assess Griffin as a scientist?

“Griffin was rather a lawless person.” Comment.

What other extraordinary things happen at the inn?