"In physics, action at a distance is the concept that an object can be affected without being physically touched (as in mechanical contact) by another object."
https://en.wikipedia.org/wiki/Action_at_a_distance
"Quantum entanglement is a bizarre, counterintuitive phenomenon that explains how two subatomic particles can be intimately linked to each other even if separated by billions of light-years of space. Despite their vast separation, a change induced in one will affect the other."
https://www.space.com/31933-quantum-entanglement-action-at-a-distance.html
Spooky Action Is Real: Bizarre Quantum Entanglement Confirmed in New Tests
https://www.livescience.com/52811-spooky-action-is-real.html
"The superposition principle is the idea that a system is in all possible states at the same time, until it is measured. After measurement it then falls to one of the basis states that form the superposition, thus destroying the original configuration. The superposition principle explains the "quantum weirdness" observed with many experiments. A classic example of this is the double-slit experiment."
http://physics.gmu.edu/~dmaria/590%20Web%20Page/public_html/qm_topics/superposition/superposition.html
"The 21 Grams Theory was a hypothesis of Dr. Duncan MacDougal who suggested that human souls have mass. He conducted various tests in 1901 to measure the weight of a soul.
On 10 April 1901, an unusual experiment was about to occur in Dorchester, Massachusetts. Dr. Duncan MacDougall was going to prove that the human soul had mass, and was, therefore, measurable."
https://www.historicmysteries.com/the-21-gram-soul-theory/
"Science can't prove that the soul exists, and scientists can't weigh it. But the bizarre story of one doctor's attempt to do just that is worth hanging around for."
https://www.livescience.com/32327-how-much-does-the-soul-weigh.html
"The E = mc2 equation represents the idea that energy and mass are correlated, that any object with mass corresponds to an equivalent amount of energy. This equation is Einstein's special theory of relativity in mathematical terms."
https://www.calculatorsoup.com/calculators/physics/emc2.php
"In particle physics, a massless particle is an elementary particle whose invariant mass is zero."
https://en.wikipedia.org/wiki/Massless_particle