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.

Poop Splash Elimination - Smarter Every Day 22

Khan for Educators: Khan Academy’s learning experience

View All

A Spoon You Can Eat Is a Tasty Alternative to Plastic Waste | Short Film Showcase

I ordered for idli sambar, and this pool is put in it. So, as he was putting the spoon, I grabbed it from his hand. I run my thumb on it; it was greasy. I took a smile and a sniff of it. It was already smelling of somewhere it’s been reused. You know, pla…

PURPOSE of WEALTH (Pt3): COMFORT

Hello Alers, and welcome back as we continue our purpose of wealth series. If you haven’t watched the first two parts covering freedom and security, we recommend you start there, as this is the first one to touch on the positive material benefits brought …

Why you are perfect #Shorts

There is someone out there who has described your physical appearance and personality as their ideal partner. Now, if only I could find them. These are shower thoughts. There is an optimal head turn speed when looking at someone. Too fast, and it’s too a…

Introduction to photoelectron spectroscopy | AP Chemistry | Khan Academy

In this video, we’re going to introduce ourselves to the idea of photoelectron spectroscopy. It’s a way of analyzing the electron configuration of a sample of a certain type of atom. So what you’ll often see, and you might see something like this on an ex…

Worked example: exponential solution to differential equation | AP Calculus AB | Khan Academy

So we’ve got the differential equation: the derivative of y with respect to x is equal to 3 times y, and we want to find the particular solution that gives us y being equal to 2 when x is equal to 1. So I encourage you to pause this video and see if you …

Identifying scaled copies

What we’re going to do in this video is look at pairs of figures and see if they are scaled copies of each other. So for example, in this diagram, is figure B a scaled version of figure A? Pause the video and see if you can figure that out. There are mu…

This Is A Light-Nanosecond!

More Articles