Mach's principle is a hypothesis first stated by Ernst Mach in 1893, which states that:
"The inertia of any system is the result of the interaction of that system and the rest of the universe. In other words, every particle in the universe ultimately has an effect on every other particle."
... England.
See: List of museums, Museums in Scotland, Museums in Wales, Museums in Northern Ireland, Museums in the Republic of Ireland
Berkshire
Reading Museum[?] ...