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

Quick Links

General science Solar Earth Electrical (amplifiers, batteries) Electrodynamics Gravity Astronomy Physics Other science DIY

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)

Earth

Bugs Bunny disproves the Flat-Earth idea (YouTube™ 1:16)

Electrical

Batteries

Two (mono and stereo) simple audio amplifiers (circuitspedia)

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)
Homemade spark transmitter (YouTube™ 4:09 by Ludic Science)
Tesla's coil papers (printed 04-02-2013)

Gravity

Suspended by magnet

Astronomy

Space (page by Noji)

Physics

All about black holes (YouTube™ 1:05:50) (excellent)

Other

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

DIY

Surface tension experiment (YouTube™ 5:19 by North Carolina Museum of Natural Sciences)
10 science fair projects (YouTube™ 11:35 by Mark Rober)
Mini Jacob's ladder (YouTube 7:38) [caution — language]
Marx generator
Quick-N-Dirty Marx generator