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I'm a complete beginner.

I don’t know if I’m getting it wrong or don’t understand it at all but I think there’s a mistake in the video. The speaker says that one of the spaceships is moving away from a given point at 30 km/s.

And they say that they do a magic video call. First thing, 30 km/s is not even remotely fast enough to cause time dilation. But also, they don’t talk about how far the spaceship has travelled or for how long it has travelled. Without those values, we can’t even calculate the time dilation.

Even if we say the spaceship traveled at 30 km/s and traveled for 100 years. At that speed there will be almost no time dilation

Hey guys

Looking for a video about grief and how much time is left with parents.

I can’t seem to find it in the channel. My friend is grieving and I want to share it with her and help her the same way it helped me…

Please direct me to see it elsewhere if it’s not available on the channel anymore

Thanks for understanding

Hello? Anyone? Any way I can make this feedback get to the spanish video editors of Kurtzgesagt?

Long-time fan here! Been watching since forever, and I wanted to show my girlfriend your videos, but she only speaks Spanish.

Here's the thing - I'm actually Mexican(Native Lat Spanish Speaker) but usually watch the videos in English, and when I tried the Spanish videos, something felt off. The narrator's voice is SOOO loud you can barely hear the background music that makes your videos special, it kindof takes out the narrative essence you guys have on the videos

Any chance you could fix the audio mixing? The music adds so much to the videos, and right now it's getting drowned out.

Thanks! 🦆

The 100,000 km blood vessel video links a "Sources & further reading:" page. That page reads:

Form the Scale of the Universe app:

"Length of Human Blood Vessels 16,598 km
Human blood vessels are really tiny, but they are everywhere in your body – arteries, veins and capillaries form a giant road system in our body. If you lined up all blood vessels of just one human, it would be around 16,598 km long. That is a little less than half of the Earth's circumference."

The video and sources page list tens of sources that use the 100,000 km figure.

The conclusion of the video is that the correct estimate is 9,000 - 19,000 km, based on the Poole et al. 2021 paper

However, the Scale of the Universe app supposedly got it right way before they could find the Poole paper. How did they get it right? What's their source for that app? When was that Scale of the Universe app released, and where can I find it?

The 100,000 km blood vessel video links a "Sources & further reading:" page. That page reads:

Form the Scale of the Universe app:

"Length of Human Blood Vessels 16,598 km  

Human blood vessels are really tiny, but they are everywhere in your body – arteries, veins and capillaries form a giant road system in our body. If you lined up all blood vessels of just one human, it would be around 16,598 km long. That is a little less than half of the Earth's circumference."

The video and sources page list tens of sources that use the 100,000 km figure.

The conclusion of the video is that the correct estimate is 9,000 - 19,000 km, based on the Poole et al. 2021 paper

However, the Scale of the Universe app supposedly got it right way before they could find the Poole paper. How did they get it right? What's their source for that app? When was that Scale of the Universe app released, and where can I find it?

I finally framed the calendar I purchased in 2017. I ran out of frames for the roughed up title page, but I promise it will get framed too!!

I recently watched Kurzgesagt’s latest video, where they spent nearly a year tracking down the popular claim that all human blood vessels, end-to-end, stretch 100,000 km. Turns out, it’s harder to trace than expected. They sifted through old references, even reaching out to Dr. Suzuki (in his 80s) to illustrate the lengths they went to, and eventually found it in The Anatomy and Physiology of Capillaries by August Krogh, who estimated the length based on muscle capillary density. The claim is roughly accurate, but it’s more of an educated guess.

Curious to see how fast I could get there with ChatGPT, I tried a quick experiment. Starting with almost no background info, I got to Krogh’s book and the context behind his estimate in just a few minutes. It made me think about the potential of LLMs in research: though often criticized (rightly so), they can save time on specific tasks, like tracking down elusive claims.

Please don’t sleep on these tools; they’re unreliable, they make up facts, and they’re controversial. But when it does get it right, it’s an order of magnitude faster than any human could be on their own.

Hey all. I’m still searching high and low for this beloved item! I can’t seem to find it anywhere, I guess this message is another PSA announcement to anyone willing to sell theirs and or scalpers who also have any. Any information would be greatly appreciated. I couldn’t afford one at the time but circumstances have change.

Have a lovely day.

They have a symbiotic relationship that dates back 450 MILLION years + and do a lot of amazing things together. I would also like to see a video just on beneficial bacteria in the garden. Something people can learn and use to be a better gardener would be amazing!

How can there be 34k likes when there are 542 views? How does that even work?

A playlist of Kurzgesagt videos about mankind colonizing the universe. Videos are ordered from humans escaping Earth's gravity all the way to the farthest places mankind will ever reach. The order is meant to be a technological journey of human advancement in space colonization and utilizing the resources of our Solar system.

1. Prison Earth: What it takes to escape Earth's gravity.
2. End of Space: The dangers space junk creates on our path to escape Earth.
3. Space Elevator: An alternative means of escaping Earth's orbit.
4. Moon Base: Our first stellar colony.
5. Asteroid Mining: Tapping into the resources in our Solar system.
6. Mars Base: Extending the reach of human colonization.
7. Skyhook: A means of system travel from planet to planet.
8. Terraform Venus: Turning Venus into a habitable Earthlike planet.
9. Terraform Mars: Turning Mars into a habitable Earthlike planet.
10. Dyson Sphere: Harnessing the power of the sun.
11. Stellar Engine: Using the sun to move the entire Solar system.
12. The Final Border: The limits that mankind will ever reach.

I personally enjoy watching it in this order, it feels like an episodic documentary. What do you all think of the order? I'm still on the fence as to where to place Space Elevator, if it should be further down the list or not. Any other videos that would fit the list? Hope you all enjoy it! And if Kurzgesagt is reading, I would love to see more videos on topics of space exploration and colonization!

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No doubt, every video is a work of art

I took the Bird to the Jenner today, next to the Königssee

I just came here to say, Kurzgesacht should do a video on sleep! 😴

Hello, I am looking for a video but can't find what I am looking for. It was a video where the size of a human lifespan is compared to the lifespan of the universe and how this is nothing compared to that. It was showing how long your life is, than how long humans are living, than how long homo sapiens is around and than how old the world is and how nothing we do is of impact or something in that context. Does anyone know what video that is? Thanks in advance

Forgot where it was but it was the universe to scale app (or whatever it was called)

What if every moment on Earth was captured, not by cameras, but by the light that reflects off our planet and drifts through space? Imagine being 50 light-years away, looking through a hyper-powerful telescope, and seeing Earth as it was half a century ago.

Could future tech let us replay history by intercepting that light? Witness epic events, forgotten moments, or even natural disasters from a distance… all from the light still traveling across the universe. Are echoes of our past just floating out there, waiting to be discovered.