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.

Debugging with stack traces | Intro to CS - Python | Khan Academy

Adding four two digit numbers

View All

Don't Make These Hiring Mistakes

I’ve been trying to hire our first engineer for a year, and like, I can’t like find anyone. And it’s not because there’s literally no one with the word engineer on their resume that they can hire, right? [Music] Hello, this is Michael with Harj and Brad…

More on Normal force (shoe on floor) | Physics | Khan Academy

Check out this fine looking sneaker right here. We’re going to use this shoe to illustrate some more challenging normal force problems, and we’re going to take this as an opportunity to discuss a lot of the misconceptions that people have about the normal…

Classical Japan during the Heian Period | World History | Khan Academy

What we’re going to do in this video is talk about roughly a thousand years of Japanese history that take us from what’s known as The Classical period of Japan through the Japanese medieval period all the way to the early modern period. The key defining …

Integral of product of cosines

We’ve been doing several videos now to establish a bunch of truths of definite integrals of various combinations of trigonometric functions so that we will have a really strong mathematical basis for actually finding the Fourier coefficients. I think we o…

The Perfect Storm | Rebuilding Paradise

The reality is that it was November 8th, and we hadn’t had any kind of significant rain. It had always rained before trick-or-treating, right? I mean, right? And now, and now we’re in these patterns here where we don’t see rain until, you know, into Novem…

The Fascinating Lives of Bleeding Heart Monkeys (Part 1) | Nat Geo Live

So National Geographic asked us here tonight to tell you about a day in the life of gelada monkeys and what it’s like to live alongside them. For the past decade, the vet and I have spent years living alongside this species in a unique kind of alpine out-…

This Is A Light-Nanosecond!

More Articles