Open Problems Column

This Issue's Column! This issue's Open Problem Column is by William Gasarch and is The Busy Beaver Function, Small Turing Machines, and Open Problems

Request for Columns! I invite any reader who has knowledge of some area to contact me and arrange to write a column about open problems in that area. That area can be (1) broad or narrow or anywhere in between, and (2) really important or really unimportant or anywhere in between.