User:RichardF/QOTD/23

< User:RichardF‎ | QOTD

Albert Einstein

Whether you can observe a thing or not depends on the theory which you use. It is the theory which decides what can be observed.

— Albert Einstein

Retrieved from "https://en.wikipedia.org/w/index.php?title=User:RichardF/QOTD/23&oldid=147975746"