15:[[47021586,{"by":"Zamoshi","descendants":96,"id":47021586,"kids":[47021936,47021979,47021983,47022117,47025971,47022097,47025433,47022009,47022049,47022078,47022490,47021728,47022094,47022060,47021826,47021931,47022107],"score":114,"time":1771138093,"title":"Ex-Tech –> Homeless in SF","type":"story","url":"https://zamoshi.substack.com/p/ninety-four-degrees"}],[46565262,{"by":"kitetm","descendants":10,"id":46565262,"kids":[46568069,46567846,46567552,46584708,46598455,46613298],"score":35,"text":"Are you coding more or less, managing people differently, or making decisions in new ways because of AI tools? Which tools (LLMs, copilots, internal agents, analytics, etc.) have meaningfully stuck, and which turned out to be hype? I’m especially interested in concrete changes to how you plan, review work, and support teams.","time":1768049227,"title":"Ask HN: Senior engineering mngrs: how has AI changed your day-to-day work?","type":"story"}],[46354489,{"by":"nicbvs","descendants":1,"id":46354489,"kids":[46369682],"score":1,"time":1766414642,"title":"Context Engineering with Claude Code: Building Smarter AI Workflows","type":"story","url":"https://tbtki.com/2025/12/21/context-engineering-with-claude-code/"}],[41159180,{"by":"drewsberry","descendants":91,"id":41159180,"kids":[41162225,41161211,41161951,41160109,41172885,41164252,41165943,41160102,41168191,41161739,41165716,41159503,41160808,41160695,41170259],"score":556,"time":1722846505,"title":"How Postgres stores data on disk – this one's a page turner","type":"story","url":"https://drew.silcock.dev/blog/how-postgres-stores-data-on-disk/"}],[40528045,{"by":"tppiotrowski","descendants":183,"id":40528045,"kids":[40535688,40532686,40534936,40535922,40541735,40540244,40532584,40535736,40532809,40533371,40535952,40533688,40534892,40538388,40535287,40532664,40536584,40532406,40535815,40532441,40532893,40532523,40533129,40539168,40538899,40534996,40533594,40534424,40532483,40534536,40536138,40534003,40540433,40535364,40541534,40538755,40533420,40534718,40533558,40540674,40536858,40546379,40541380,40537351,40538729,40540040,40541244,40538911,40541301,40534013,40536396,40544280,40535865,40534862,40538735,40539935,40535003,40546033,40535962,40534385,40532375,40535863,40542805,40543425,40536303,40532803,40545705,40537539,40539461,40535327,40535945,40540167,40534272,40533221,40536968,40532512,40548960,40541899,40539611,40532891,40539312,40528049,40536240],"score":685,"text":"I've been working on this project for about 4 years. It began as terrain only because world wide elevation data was publicly available. I then added buildings from OpenStreetMap (crowd sourced) and more recently from Overture Maps data. Some computer vision/machine learning advancements [1] in the past few years have made it possible to estimate tree canopy heights using satellite imagery alone making it possible to finally add trees to the map. The data isn't perfect, but it's within +/- 3 meters of so. Good enough to give a general idea for any location on Earth. Happy to answer any questions.

[1] https://www.nature.com/articles/s41559-023-02206-6","time":1717099828,"title":"Show HN: Every mountain, building and tree shadow mapped for any date and time","type":"story","url":"https://shademap.app"}],[40454026,{"by":"zsmikloszs","descendants":2,"id":40454026,"kids":[40459653],"score":1,"text":"Hey HN,

I just launched TestFast, a SaaS tool designed to help startups validate their business ideas quickly and efficiently.

Why is this important? 43% of startups fail because they lack product-market fit – they create something nobody wants to pay for.

With TestFast, you can:\n- Generate a landing page for any new business idea by answering a few simple questions.\n- Include a newsletter subscription option to gauge interest.\n- Send subscribers a questionnaire with a 30% discount offer (if the product goes live) to better understand your audience.\n- Track the number of visitors, subscriber counts, and questionnaire responses to measure interest.

Get real insights and validate your ideas before you invest time and resources in product development.

Check it out: www.testfa.st

P.S.: The site speed is horrible, thank you for your patience! - It's still an MVP.

Would love to hear your feedback!","time":1716468369,"title":"Show HN: TestFast – A Tool to Test Your Business Ideas","type":"story","url":"https://testfa.st/"}]]

user:	thomasben
created:	July 23, 2023
karma:	6