Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Tight junction is the term for a watertight seal between two adjacent animal cells.

Output: What is the term for a watertight seal between two adjacent animal cells?


Input: Consider Input: When light passes from one medium to another, it changes speed.

Output: When light passes from one medium to another, it changes what?


Input: Consider Input: Radioisotopes type of isotopes have short half-lives and are given in very low doses.


Output: What type of isotopes have short half-lives and are given in very low doses?