Sum of three cubes by Ciro Santilli 40 Updated 2025-07-16
Compared to Waring's problem, this is potentially much harder, as we can go infinitely negative in our attempts, there isn't a bound on how many tries we can have for each number.
In other words, it is unlikely to have a Conjecture reduction to a halting problem.
Video 1.
3 as the sum of the 3 cubes by Numberphile (2019)
Source.
Waring's problem by Ciro Santilli 40 Updated 2025-07-16
And when it can't, attempt to classify which subset of the integers can be reached. E.g. Legendre's three-square theorem.
Electrical impedance by Ciro Santilli 40 Updated 2025-07-16
It really allows you to do alternating current calculations much as you'd do DC calculations with resistors, quite poweful. It must have been all the rage in the 1950s.
Video 1.
Why Relativity Breaks the Schrodinger Equation by Richard Behiel (2023)
. Source. Take a plane wave function, because we know its momentum perfectly. Apply a constant voltage to an electron. You can easily bring it beyond the speed of light at about 255.5 keV.

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