An interesting theory about why the music scales take on the values they have.

• dissonance of two pure tone comes from the inaudible beats in the superposition
• the base frequency + the overtones determine the note and the timber
  • overtones are not necessarily harmonics. it depends on the musical instrument.
• adding up all the dissonance graph of all overtones of two notes, we can get a graph of dissonance, where the troughs have lowest dissonance.
  • do the same for three notes, we get a 3-d graph of dissonance.
  • the insight is that we should consider not only the dissonance of the base notes but also of all overtones
• it's found that many scales (relative to the base) and chords (relative to the lowest note) fall in the troughs of this graph
• conclusion: overtones in the instruments influence the musical scales used by a culture

Search the transcripts of PBS Space Time.

Air wave, oscillation and sound explained through an interactive article.

Play with quantum experiments.

A game where you place planets in a system. The goal is to place as many planets as possible while avoiding collision or flinging them out.

It's an interesting playground for learning concepts like why small planets are likely located in near star orbit, three-body problem, etc.

A really informative article that explained a lot of mysteries I previously had.

For example, given that a black hole can be described from just three numbers and thus "highly ordered", how is it that a black hole is said to have a very high entropy?

The biggest takeaway from the article (to me) is that: entropy is not about disorderness, but rather about the amount of information (microstat) packed in an apparent phenomenon (macrostat).

A really interesting thread on relativity. OP analogize the nonlinearity of slopes comparing to angles to describe how speed in relativity is an more cumbersome defined property compared to a more tidy notion of "rapidity" which is linear.

An interesting read.

A Slower Speed of Light is a first-person game prototype in which players navigate a 3D space while picking up orbs that reduce the speed of light in increments.