Title: Indigenous peoples of the Americas.
Question: What do studies on the genetics of the first American inhabitants conclude about their ancestral population?

Title: Planck constant.
Question: What is required for the electromagnetic field to come to thermal equilibrium?

Title: Anti-aircraft warfare.
Question: What can be deployed in fixed launchers but re-deploy at will?

Title: Gene.
Question:
Often, how large a part of the structure of a gene is the protein coding sequence?