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.

Limits at infinity of quotients with trig (limit undefined) | AP Calculus AB | Khan Academy

Using the distributive property when multiplying

View All

This Greek Cave is Teeming With History—and Bodies | National Geographic

Classical Greece didn’t just come out of nowhere. If you really want to understand where the Greece of Athens, the Greece of the Acropolis, came from, you need to look way back in the past. You need to look several thousand years back in the past at place…

Electric current | Physics | Khan Academy

Electricity that lights up a bulb looks very different than lightning strikes, but they’re actually more similar than one might think because they both have electric current. So, let’s understand what electric current is, how they are produced, and also g…

Sine equation algebraic solution set | Trigonometry | Precalculus | Khan Academy

The goal of this video is to find the solution set for the following equation, so all of the x values. And we’re dealing with radians that will satisfy this equation. So I encourage you, like always, pause this video and see if you can work through this o…

Filming The Queendoms | National Geographic

My name is Aaron Rainey. I’m a wildlife camera woman, and for the past two and a half years, I’ve been filming wildlife around the globe for the series “Queens.” Every individual connects with nature in their own way, and using a camera can be a way to ex…

State checks on the judicial branch | US government and civics | Khan Academy

In previous videos, we had talked about the 1896 Supreme Court case Plessy versus Ferguson, which is a good one to know in general if you’re studying United States history and/or United States government. But this is where we got the principle of separate…

Connotation | Reading | Khan Academy

[David] Hello, readers. Today, let’s talk about feelings. Specifically, the way the words make us feel. That’s right, I’m talking about connotation. The way the word feels, the context around it. Imagine a rock in a stream. Well, connotation is the way th…

This Is A Light-Nanosecond!

More Articles