Physics

11 ideas, each explained on one page with a 60-second lesson you can play right there.

Anthropic principle The anthropic principle explains that we observe physical constants suitable for life because observers cannot exist in a universe without them.
Block Universe The block universe theory treats time as a fourth dimension where past, present, and future events are all equally real and fixed.
Copernican Principle The Copernican principle states that Earth occupies an average position in space and that humans are not privileged observers of the universe.
Determinism Determinism is the philosophical view that every event is the inevitable result of preceding events and the laws of nature.
Doppler Effect The Doppler effect changes the observed pitch or frequency of waves when a source and observer move relative to each other.
Drake Equation The Drake equation is a mathematical formula that estimates how many active, communicative alien civilizations exist in our galaxy.
Entropy Entropy is a measure of how widely energy in a system spreads out and becomes unavailable to do useful work.
Fermi Paradox The Fermi paradox exposes the clash between the high statistical odds of alien life across billions of stars and our complete lack of evidence for it.
Jet Propulsion Jet propulsion pushes objects forward by shooting out fluid in the opposite direction, powering aircraft, rockets, and swimming squid.
Laplace's Demon Laplace's Demon is a thought experiment about a hypothetical intellect that knows the exact position and motion of every particle in existence.
Rhythm Rhythm is the regular flow of movement or sound created by alternating strong, accented elements with weaker ones.