Atmospheric optical phenomena refer to various visual effects that occur in the atmosphere due to the interaction of light with particles, gases, and other elements in the Earth's atmosphere. These phenomena can create spectacular and sometimes striking displays in the sky. Some common types of atmospheric optical phenomena include: 1. **Rainbows**: Formed by the refraction, dispersion, and reflection of sunlight in water droplets, resulting in a spectrum of colors in the sky.

"Dawn" can refer to several different concepts depending on the context: 1. **Natural Phenomenon**: Dawn is the time of day when the sun begins to rise, marking the transition from night to day. It is characterized by the gradual illumination of the sky and often includes beautiful colors as the sun's rays scatter through the atmosphere.

Ecological processes are the natural mechanisms and interactions that occur within ecosystems, influencing the distribution, abundance, and dynamics of organisms and their environments. These processes can impact biodiversity, community structure, nutrient cycling, energy flow, and the overall functioning of ecosystems. Key ecological processes include: 1. **Photosynthesis**: The process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose.

Meteorological phenomena refer to observable weather events and characteristics that result from atmospheric conditions. These phenomena include a wide range of occurrences that can be local, regional, or global in nature. Some common meteorological phenomena include: 1. **Rain**: Precipitation in the form of liquid droplets, which occurs when moisture in the atmosphere condenses and falls to the ground. 2. **Snow**: Precipitation in the form of ice crystals that occurs when temperatures are below freezing.

This is quite in-depth, pretty good.

Unrelated to the Khan Academy.

An air shower in physics refers to a cascade of secondary particles produced when a high-energy cosmic ray, typically a proton or atomic nucleus, interacts with the Earth's atmosphere. When these cosmic rays, which can have energies many orders of magnitude greater than that achievable in human-made particle accelerators, collide with atmospheric molecules, they produce a wide variety of secondary particles, including pions, muons, electrons, and photons.

The term "reverse waterfall" can refer to various concepts depending on the context in which it is used. Here are a couple of interpretations: 1. **Project Management/Software Development**: In some contexts, particularly in agile methodologies, a "reverse waterfall" can refer to a non-linear approach to project development that contrasts with the traditional waterfall model. The waterfall model typically involves a linear, sequential design process where each phase must be completed before the next begins.

On github.com/cirosantilli/china-dictatorship:

This section groups conjectures that are famous, solved or unsolved.

They are usually conjectures that have a strong intuitive reasoning, but took a very long time to prove, despite great efforts.

The list: en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics

Same style as MNIST: 28x28 grayscale images, but with clothes rather than hand written digits.

It was designed to be much harder than MNIST, and more representative of modern applications, while still retaining the low resolution of MNIST for simplicity of training.

"Aurora" can refer to several different things depending on the context. Here are a few common meanings: 1. **Natural Phenomenon**: In the context of natural phenomena, an aurora refers to the auroras, specifically Aurora Borealis (Northern Lights) and Aurora Australis (Southern Lights). These are natural light displays predominantly seen in high-latitude regions around the Arctic and Antarctic.

Auroral chorus is a natural phenomenon associated with the auroras, which are spectacular light displays occurring primarily in polar regions. These visual displays are caused by the interactions between charged particles from the solar wind and Earth's magnetic field and atmosphere. The term "auroral chorus" specifically refers to a type of natural radio wave emissions that occur in the vicinity of the auroras.

Some good insights on the earlier history of the industry at: The Supermen: The Story of Seymour Cray by Charles J. Murray (1997).

A pair of Austrailan deep learning training provider/consuntants that have produced a lot of good free learning materials:Authors:

The main FeathersJS hello world demo. Notable missing things...

Got it working as mentioned at: github.com/cirosantilli/feathers-chat/tree/sequelize-pg

One major step was to port to PostgreSQL as shown at feathers-chat PostgreSQL.

Bibliography:

There's also a heroku branch at: github.com/feathersjs/feathers-chat/tree/heroku, but it also seems to use NeDB? So you can have a filesystem in Heroku? Doesn't seem so: stackoverflow.com/questions/42775418/heroku-local-persistent-storage