Political quandaries and the accompanying moral ambiguities are recurrent themes in his works. And Other Cosmic Quandaries is a 2007 popular science book written by Neil deGrasse Tyson. Its development has demonstrated many of the quandaries that face local public transport planners. In 1998 he wrote the award-winning game "Quandaries" for the U.S. Department of Justice. Two books derived from "Quantum" materials have been published&colon; "Quantoons" and "Quantum Quandaries". Many of these articles had previously appeared in the "Quality Quandaries" column of "Quality Engineering".