Einstein CentennialAnswer
Can quantum entanglement send messages faster than light?
Einstein called it “spooky action at a distance,” and the matching is real, but here is why nobody can use it to send a message faster than light.
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FROM THE QUESTION LIBRARY
Short answers, with sources.
Einstein CentennialAnswer
Did Einstein lose his argument that God does not play dice?
A century after his famous letter to Max Born, experiments have ruled on part of Einstein’s hope, while the question of dice itself is still argued.
Einstein CentennialAnswer
Is anything truly random?
Dice, coins and weather follow fixed rules we can’t track, but quantum events are different, and whether they are random at the deepest level is still argued.
The UniverseAnswer
Is time travel possible?
Travel into the future happens every day and has been measured; travel into the past is still an open question in physics, and here is why.
The UniverseAnswer
What is a black hole, really?
Not a hole and not a cosmic vacuum cleaner: here is what a black hole is, how we know they exist, and where the real mysteries begin.