“If you have a fascination for the subject, then the book is for you. … He believes it would be favourable to a time traveller to remain detached and observe from a distance.” (John Silvester, Odyssey The e-Magazine of the British Interplanetary Society, Issue 66, 2020)“The Time Machine Hypothesis captures the wonder that so many readers of sf feel when they first learn that scientists in the real world actually do study the possibility of time travel and that there may be something to these fantastic stories after all.” (James Hamby, Science Fiction Studies, Vol. 47, November, 2020)