Veritasium - What is NOT Random?

Short Summary

Main recommendation: Treat the future as partly predictable but not fully determined, because quantum randomness continually generates new information and keeps the universe's future open. The video argues that information is fundamentally entropy (disorder), so the second law of thermodynamics, which says entropy increases over time, is what makes genuinely new and unpredictable outcomes possible. It frames scientific theories as ways of compressing the universe into short descriptions, and treats randomness as the part of reality that cannot be compressed.

Key Points

• Information is connected to order and redundancy: predictable patterns (such as letters following "Q" with "U") carry little information, while random sequences carry the most.
• Claude Shannon estimated English is about 75% redundant, which is why English text can be compressed.
• Maximum information corresponds to maximum entropy; random noise has the most information but no meaning to humans, while meaning is found in the middle between order and disorder.
• Laplace's idea that knowing every particle's position and velocity would reveal the entire future is challenged by quantum mechanics, which only gives probabilities.
• Each quantum measurement creates new information, which the video speculates (as its 'best bet') may be the source of rising entropy and the second law of thermodynamics.
• Chaotic systems (the butterfly effect) can amplify tiny quantum events into large differences, which the video speculates could be a source of free will.

Details Worth Noting

• Compression example: Ordinary video can be compressed to about one thousandth of its original size by storing only the pixels that change between frames.
• Datamoshing is described as applying the movement data from one video to the pixels of another, creating trippy effects.
• General relativity is cited as a single short equation that explains falling apples, lunar and planetary orbits, black hole behavior, and the expansion of the universe from the Big Bang, allowing eclipses to be predicted thousands of years ahead.
• Einstein's objection "God does not play dice" is presented as the reaction to quantum probability; the video suggests the randomness may be fundamental rather than a sign of incomplete theory.
• The video presents the free-will link as speculative, stating that our brains may be chaotic systems amplifying quantum events.

Bottom Line

The universe is not fully predictable, since quantum events add new information and increase entropy over time, leaving the future genuinely open.