By Gus Green
By Keith Houston
By Roma Agrawal
By Tom Chatfield
By Kat Jungnickel (Goldsmiths College (University of London))
By Richard Wallace
By Colin G. Maggs
By David W. Anthony
By Michael H C Baker
By Kevin McCormack
By Galileo Galilei, Albert Van Helden
By Julian Holland
By Paul Kennedy
By Katsuhiko Tokunaga
By David Watkins, John Wilson
By Jeffrey Quill
By Malcolm Gladwell
By David C. Cassidy
By I. Bernard Cohen (Harvard University)
By Richard Morris
By Vaclav Smil
By Don Middleton
By George Dyson
By Ian Allan
By Peter Randall
By Fred Dibnah, David Hall