This Is A Light-Nanosecond!

less than 1m read

·Nov 10, 2024

I trimmed my beard yesterday, so I'm feeling a bit like a baby today. But look at the trimmings! Specifically this one that is 2.4 fortnits worth of beard growth. How do I know? Well, because of this tool I made. This about 5 years ago to free people from the tyranny of standard units. It measures in weird units like beard fortnits, the typical length of beard grows every 2 weeks.

It's also got light pico seconds, how far light travels in a trillionth of a second. If you didn't get one 5 years ago but you're subscribed much later this year, three boxes from now you'll get one in a special Legacy box we're making. The entire ruler is exactly one light nond long. This is how far light travels in a vacuum in 1 nond.

Everything I see from this distance, I'm seeing as it was a billionth of a second ago. It's a reminder that you live in the past because light has a finite speed. You do not see things as they are; you see the universe only as it was. Also, you're going nowhere if you fall asleep tonight in the same bed you woke up in this morning. Your average velocity for the day will be zero.

Lytic and lysogenic cycles | Viruses | High school biology | Khan Academy

Uncle Tom's Cabin part 2

View All

The van der Waals equation | Khan Academy

We have so far spent many videos talking about the ideal gas law: that pressure times volume is equal to the number of moles times the ideal gas constant times temperature measured in Kelvin. What we’re going to do in this video is attempt to modify the i…

Anxious | Vocabulary | Khan Academy

Oh boy, oh geez, wordsmiths, I’m not feeling so hot about this word. I tell you what. The word is anxious, or if you prefer, anxious. It’s an adjective that means very worried. You might have seen it in its noun form, anxiety, which is the state of being …

My 2 Worst Investments EVER

Hey guys, welcome back to the channel! In this video, we’re going to be talking about literally my two worst investments ever. It’s kind of funny; sometimes in the YouTube comments, I’ll get a comment which is something like, “Oh, Brandon, you’re very qu…

CGP Grey was WRONG

As Mark Twain once quipped, “If I had more time I would have written a shorter letter.” There’s a pair of videos on my channel that were in the works for over a year. The Tekoi Videos. One exploration and one explanation. And while the exploration video …

EXCLUSIVE: Fur Seals Are Back From the Brink on California Islands | National Geographic

The northern fur seal was a top predator in this area, and 150,000 of them were removed from the ecosystem. My name is Jim Teats, and I’m a biologist for Point Blue Conservation Science. I work on Southeast Farallon Island, which is 30 miles west of San F…

Free energy of dissolution | Applications of thermodynamics | AP Chemistry | Khan Academy

The term dissolution refers to the dissolving of one substance in a solvent. The dissolved substance is now called a solute, and the solute plus the solvent form a solution. If the standard change in free energy, delta G naught, is less than zero, the dis…

This Is A Light-Nanosecond!

More Articles