About the Author Dr MARK Denny pursued research in theoretical physics at Edinburgh University and Oxford University, before embarking on a 20-year career in the aerospace industry as a radar and sonar systems engineer.
Dr ALAN MCFADZEAN conducted research in Astrono.
Mark is now retired and lives on Vancouver Island in western Canada, where he has written fourteen popular science books.
He authored over fifty technical papers on many subjects in physics and engineering.
About the Author Dr MARK Denny pursued research in theoretical physics at Edinburgh University and Oxford University, before embarking on a 20-year career in the aerospace industry as a radar and sonar systems engineer