The characteristic of scientific progress is
our knowing that we did not know.
— Gaston Bachelard

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General science

Solar

Harvard solar cycle prediction (abstract) Cycle 25 maximum = 2023.2 ± 1.1 with a peak of 154 ± 12 sunspots
SolarHam ham-related solar conditions (aurora, sunspots, activity, forecast)

Electrical

Batteries

Revolutionary nuclear battery — too good to be true? NS Energy New Atlas TNW (The Next Web) TechCrunch Popular Mechanics Wikipedia

Electrodynamics

Wave-particle duality (Viktor T. Toth, 08-26-2020)
The Nature of Light (UNSW)

Gravity

Astronomy

Other

ISS Tracker (real-time graphical tracker, incuding current altitude and speed)
Spot the Station (can sign up for visible alerts, app)