"The observer effect is the phenomenon in which the act of observation alters the behavior of the particles being observed. This effect is due to the wave-like nature of matter, which means that particles can exist in multiple states simultaneously. When an observer measures a particular property of a particle, they are effectively collapsing the wave-function of that particle, causing it to assume a definite state."
https://www.scienceabc.com/pure-sciences/observer-effect-quantum-mechanics.html
DR. QUANTUM - DOUBLE SLIT EXPERIMENT
"Beams of light are often described as having wavelengths, yet they are also described as being composed of particles called photons. Light is unique in that it can be described as both a wave and a particle."
https://www.worldatlas.com/space/is-light-a-wave-or-particle.html
"The wave-particle duality principle of quantum physics holds that matter and light exhibit the behaviors of both waves and particles, depending upon the circumstances of the experiment. It is a complex topic but among the most intriguing in physics."
https://www.thoughtco.com/wave-particle-duality-2699037
"If quantum physics is right, then wave-particle duality is real, even for gravitational waves."
https://www.forbes.com/sites/startswithabang/2019/08/15/can-we-test-gravitational-waves-for-wave-particle-duality/?sh=4e09550f53bc
"Physicists can’t quite wrap their heads around the graviton, the quantum particle of gravity that’s almost impossible to detect.
Needless to say, all of this makes gravity — and the search for the graviton — a core challenge of contemporary physics."
https://now.northropgrumman.com/the-graviton-the-quantum-particle-that-makes-the-world-round/