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.

We Need to Rethink Exercise (Updated Version)

Defining appropriate quantities for modeling | Working with units | Algebra I | Khan Academy

View All

Trig limit using pythagorean identity | Limits and continuity | AP Calculus AB | Khan Academy

Let’s see if we can find the limit as theta approaches 0 of ( \frac{1 - \cos(\theta)}{2 \sin^2(\theta)} ). And like always, pause the video and see if you could work through this. Alright, well our first temptation is to say, well, this is going to be th…

An In-Depth Interview with Emily Watson From 'Genius' | Genius

[music playing] EMILY WATSON: Hi, I’m Emily Watson. I play Elsa Einstein, a genius. Please don’t. This is the third time I’ve played Mrs. Geoffrey Rush. And we actually have a really nice working relationship. We just have that sense of feeling comfortab…

Accelerate Your Career With These 15 Unbeatable Skills

What if we told you that how far you climb up the corporate ladder has nothing to do with your competency? Your boss proves it. And although you can’t fake your way all the way to the top, the majority of competent people get stuck much lower in the hiera…

15 Things Broke People Always Have Money For

You personally know that they don’t have any money yet. They’re still spending like they didn’t just ignore that third eviction notice. From a financial perspective, some people are just built different, but not in a good way. They spend their money on du…

Introduction to real gases | Intermolecular forces and properties | AP Chemistry | Khan Academy

In several other videos, we have talked about the ideal gas law, which tells us that pressure times volume is going to be equal to the number of moles times the ideal gas constant times the temperature measured in Kelvin. Now, in all of our studies of the…

Jeff Bezos – March 1998, earliest long speech

Good evening and welcome to the annual A.B. Dick lecture on entrepreneurship at Lake Forest College. Lake Forest College, 32 miles north of Chicago, was established in 1857 as a private co-educational liberal arts college. Lake Forest College engages our …

This Is A Light-Nanosecond!

More Articles