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.

Watch National Geographic Staff Answer Nearly Impossible Geography Questions | National Geographic

Why I opened the first private jet showroom in the world!

View All

Possession for words ending in “s” | The Apostrophe | Punctuation | Khan Academy

Hello Garans, hello Paige, hi David. So, we’re talking about possession for names or words ending in the letter S. So, there’s some confusion, I think, about what to do if you’ve got to make someone’s name possessive if their name ends in an S. Like, for …

How to Make a Delicious Meal For Under $10 | Chef Wonderful

Who made this? Oh, I did! Wow, I’m gonna cry. It’s a masterpiece that should get an Emmy, that should get a Tony, all of it. And that still wouldn’t be enough for what that was. [Music] [Applause] [Music] Chef Wonderful here! Let’s talk about suffolak…

Relative maxima and minima worked example

This is the Khan Academy exercise on relative maxima and minima, and they ask us to mark all the relative maximum points in the graph. Like always, pause this video and see if you can figure out which are the relative maximum points. Okay, now let’s work…

Geoengineering: A Horrible Idea We Might Have to Do

By the end of the 21st century, humanity is becoming desperate. Decades of heat waves and droughts have led to unusually poor harvests, while the warming oceans yield fewer fish each year in the tropical zones. Millions suffer from famines, and resource w…

Relating fractions to 1

We are told to select the two fractions that are greater than one, so pause this video and see if you can figure out which two of these fractions are greater than one. All right, now let’s work on this together. The main realization here, the main thing …

How to Build a Lean-to Shelter | Live Free or Die

[Music] I see white oak trees. I’ve got P medals to build with. This is a good spot. Shelter is critical. Without shelter, I’m not a trapper. I’m going to be out there surviving instead of trapping. That’ll be the framework of my lean-to. A lean-to shelt…

This Is A Light-Nanosecond!

More Articles