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.

Biggest Money Myths (Debunked)

Make Abundance for the World

View All

Debunking 3 myths about air pollution | Nat Geo Explores

(upbeat music) - [Narrator] Ever think of how many breaths of air you take in a day? It’s a lot, like 20 thousand, give or take a few. All day, all night, our bodies are at work bringing in the good (bell dings) and kicking out the bad (buzzer sounds). Bu…

GoodBoy3000 | Khaffeine, an audio journey by Khan Academy

[Music] Every morning, your neural chip alarm goes off at 5 a.m. metropolitan standard time. You’d prefer to be woken up by the sun, but nobody in your sector of the city is allowed to venture to the upper levels to experience real sunlight. Oh well, chip…

Weaver Ant Chutney | Gordon Ramsay: Uncharted

It’s the day of the final cook, and I should be getting my fires going. Good morning, this is B. How are you? But I have a lead on one more special ingredient that I’m told can be harvested nearby. What is this secret ingredient? “Phegley, Sydney, multi-…

Exclusive: Russian Foreign Minister Sergey Lavrov Describes the War With the US and How to End It

Minister Le, thank you for doing this. Um, do you believe the United States and Russia are at war with each other right now? I wouldn’t say so, and uh, in any case, this is not what we want. Uh, we would like to have normal relations with all our neighbo…

For parents: Setting a daily learning schedule for elementary school students

All right, hi everyone! Thank you so much for joining our parent webinar on how to create a schedule for your third through fifth-grade student, as well as how you can use Khan Academy resources and tools to support your child’s learning at home. So you c…

How to Get Rich Without Getting Lucky (Naval Ravikant)

So what if I told you there was an instruction manual on how to get rich in today’s economy? Would you want to know what that instruction manual consisted of? Believe it or not, this actually exists, and we’re going to go through it all in today’s video. …

This Is A Light-Nanosecond!

More Articles