From top, left to right
# Schematic of the CANDU design of commercial heavy water reactors
# Chicago Pile-3, the world's first heavy water reactor, built in 1943 for the Manhattan Project
# An early patent drawing for a heavy water reactor, by Enrico Fermi and Leo Szilard
# Bruce Nuclear Generating Station, one of the largest CANDU plants in Canada
# Kaiga Generating Station, one of the largest IPHWR plants in India (en)
