Friendly reminder that irradiating your favorite metals with neutrons makes your bolts swell and impossible to remove. Nothing worse than neutron swollen bolts.

Wolves were reintroduced to Yellowstone National Park in 1995. This has had massive ecological benefits. What I didn't know until I visited Yellowstone recently was that the entire park, bigger than the state of Delaware, only has 124 wolves.

The velocity of a satellite is inversely proportional to the square root of the radius of its orbit.

Broadcast radio began in 1920.

Connecting the stars into constellations a new way johndcook.com/blog/2023/03/2…

Kepler's second law: A straight line from the sun to a planet sweeps out equal areas in equal time.

Cartoon guide to soldering log.andie.se/post/397677855…

Hereafter, when they come to model heaven And calculate the stars: how they will wield the The mighty frame, how build, unbuild, contrive To save appearances, how gird the sphere With centric and eccentric scribbled o’er, Cycle and epicycle, orb in orb. Paradise Lost, Book VIII

Power = work / time

Asteroid Search zooniverse.org/projects/iascs…

Technicium is mostly man-made, though traces have been found in nature.

Maxwell published the laws of E&M as 20 equations. Now in modern notation they are four equations.

Kinetic energy = 1/2 mass * velocity²

There were several competing theories of E&M during Maxwell's lifetime. Maxwell's theory triumphed a decade after he died.

'It's not so easy to free oneself from the idea that coordinates must have an immediate metrical meaning.' -- Albert Einstein

In the absence of moving air around it, smoke obeys the same physical laws as a liquid. It flows…

Oersted discovered in 1820 that electric currents generate magnetic fields.

Stigler's law and Avogadro's number johndcook.com/blog/2012/01/0…

Faraday discovered in 1831 that changing magnetic fields generate electric currents.

'Water continually dropping will wear hard rocks hollow.' -- Plutarch, c. 100 AD