How does receiver offline cashu work? If the sender locks the funds while they are online, can they ever get them back if they don't spend it? Only solution I could think of is locking the the funds until a timeout is reached. How is this currently done? CC @calle

It's always a bad time to buy graphic cards, isn't it.

AI-generated articles are the cancer of the Internet.

Are there any good Nostr icons for linking to my profile from my website? Something like these icons would be nice, in svg-format:

TW Elements

Tailwind CSS Social Media Icons & Buttons - Free Examples

Use responsive social buttons component with helper examples for brand icons, facebook, twitter, youtube, instagram, github & more. Open source lic...

Also: Where do you guys link to? To your favorite Nostr client?

I replaced my old WordPress blog with a new static generated one. I used Astro for it. Contrary to my expectations, I ended up really liking it! Especially the auto-optimizing image feature is pretty useful. The option to add other client-side frameworks later on is cool, too.

Took three days, but I found the bug.

BitVM looks interesting! Does anyone know a good (technical) video, that explains it in detail?

Debugging my app on my main phone and wondering why my "actively burned kcal" are 0. Just realized I used my dev-phone for my workout and haven't synchronized the data yet. 3h lost 😅

"Calories burned" vary greatly between different apps and gym equipment. But why? I found two reasons: * Some display "total calories" burned, some only the "additional calories". * The more info the device has about you, the better it can estimate your burned calories. During exercise, your heart rate, VO2max, age and sex are most important. Removing VO2max works, too. Be skeptical if the device doesn't know your age or your heart rate! There's more to it, obviously. But that's what I found while searching for the most accurate way to calculate burned calories in my app.

There are so many wearables out there that track sleep-stages. Why are there no papers on how to detect falling asleep and waking up? It seems to be all guesswork based on accelerometer data and heart rate. Which doesn't seem to be enough to be "good enough" from what I can determine. Why is this not a solved problem yet?

Spotted in Berlin

It is possible to estimate calories burned while exercising using your heart rate (HR). But it is not straight forward. The HR to kcal correlation is not linear. At least not always. There exists an HR that defines when your body goes into "I'm doing physical activity"-mode. This HR is called "Flex HR" or "Flex Point". An HR lower than that seems to always burn an almost fixed amount of kcal, independently of your HR. Your maintenance energy. An HR higher than "Flex HR" seems to be linearly correlated to the amount of kcal you burn. The higher your HR, the more kcal you burn. But how do you get this "Flex HR"? Unfortunately I didn't find a formula to estimate it without actively following a protocol. The "Flex HR" was originally calculated by this formula: The mean of the highest HR for a standing activity and the lowest HR of exercise activities. [1] Since the purpose of the "Flex HR" is to decide if you are at rest or doing physical exercise, it is nowadays defined more broadly: The average of the highest resting HR and the lowest exercising HR. [2] [1] LIVINGSTONE, M. B., et al. Simultaneous measurement of free-living energy expenditure by the doubly labeled water method and heart-rate monitoring. The American journal of clinical nutrition, 1990, 52. Jg., Nr. 1, S. 59-65. [2] LEONARD, William R. Measuring human energy expenditure: what have we learned from the flex‐heart rate method?. American journal of human biology, 2003, 15. Jg., Nr. 4, S. 479-489.

Did you know that humanity used math for a long time without the concept of "zero"? Some cultures even outright banned zero, because it could reject mathematical proofs for Gods existence. I had no idea! I enjoyed the book "Zero" by @cgseife way more than I thought.

Good morning Nostr! Great day for some coding!

Good morning!

Found this grapevine today, and decided to put my least-happy orchid on it. Saw this done in a greenhouse some time ago. I hope it will be happy on its new spot 🤞

Good morning!

I'd love to play a round of Catan right now 😄

Is "Everything Everywhere All At Once" good?

You cannot self-custody stocks, right? So how do I know that the broker actually bought the stocks I instructed them to buy?