The famous double-slit experiment proves that light travels both in individual particles called photons and also as a mathematical probability wave. Matter itself exhibits this particle-wave duality which allows objects to exist in two different places at the same time, depending on whether of not you are looking (testing) at it.
Scientists have recently been able to get molecules as large as 2000 atoms to exhibit this duality!
What is quite interesting is the results of a recent survey :
A recent survey of quantum physics instructors at the University of Colorado and elsewhere all of whom use quantum mechanics in their research found that 30% of those surveyed thought of the wave function as a physical matter wave, while nearly half preferred to view the wave function as containing information only - Article
Wow, this is huge! The most fundamental element of our universe is information!
Why are all protons and electrons identical to each other? Because they are all from the same information mold regardless of substance. When you've seen one, you've seen them all.
Where did this information come from? The origin of information is a big problem for materialists.