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.

The Most Radioactive Places on Earth

Super Reefs (Short Film) | Pristine Seas | National Geographic Society

View All

Models of voting behavior | Political participation | US government and civics | Khan Academy

What we’re going to do in this video is start to think about voting behavior. In particular, we’re going to start classifying motivations for why someone votes for a particular candidate. I’m going to introduce some terms that will impress your political …

14 minutes of more useless information..

[Music] As I was getting ready to go out the other day, I realized I couldn’t button my pants up all the way. I realized I was gravitationally challenged and that I had been growing in all the wrong directions. So I started doing what any reasonable perso…

A day in my life in JAPAN vlog- A productive day

Good morning. Good morning! I start my day by having my grandparents’ traditional Japanese breakfast. We always have a piece of salmon grilled and then a huge salad, rice, and a miso soup. After my breakfast, I always have a cup of coffee because I’m lite…

Ancient Rome 101 | National Geographic

[Narrator] The story of ancient Rome is a story of evolution, of how a civilization’s ability to adapt and dominate can lead to its survival for over 1,000 years. Rome began as a small village on central Italy’s Tiber River. In the coming centuries, it gr…

Khan Academy Best Practices for Elementary School

Hey everyone, this is Jeremy Schieffling with Khan Academy. I’m so excited that you joined us today, not just because Khan Academy really wants to support you during this challenging time, but as a former kindergarten teacher, this session that’s dedicate…

Would You Choose Life On Earth Or in Space? #kurzgesagt #shorts

Spending your entire life in space. If there’s another planet suitable for humans, it will be quite a long journey to get there. Even traveling at one percent of the speed of light, it would still take 10,000 years to go only 100 light years. This means …

This Is A Light-Nanosecond!

More Articles