50 legendary internet rabbit holes you can spend hours exploring👇
- zoom.earth — Watch the world via live satellite imagery
- flightradar24.com — See every plane currently in the sky
- marinetraffic.com — Track all ships at sea in real time
- windy.com — Live map of winds and storms
- lightningmaps.org — Watch lightning strikes hitting Earth in real time
- earthquake.usgs.gov — Live list of recent earthquakes
- submarinecablemap.com — Ocean cables carrying the internet
- globalforestwatch.org — Watch forests disappear from space
- worldometers.info — The world's statistics, second by second
- internetlivestats.com — Current number of tweets and searches being posted
- thetruesize.com — Compare the true sizes of countries
- oldmapsonline.org — Maps from centuries ago
- davidrumsey.com — Archive of 150,000 historical maps
- openstreetmap.org — World map drawn by volunteers
- window-swap.com — Look out the window of a random person around the world
- virtualvacation.us — Virtual walks through cities
- mapcrunch.com — Teleport to a random spot on Earth
- atlasobscura.com — Catalog of the world's strangest places
- neal.fun — Interactive knowledge experiences
- htwins.net/scale2 — Scale journey from atom to universe (Updated HTML5 link)
- eyes.nasa.gov — Explore the solar system in 3D
- stellarium-web.org — Real sky map in your browser
- apod.nasa.gov — NASA's astronomy picture of the day
- images.nasa.gov — NASA's entire visual archive, free
- pudding.cool — Visual articles told through data
- ourworldindata.org — The state of the world with real data
- gapminder.org — What we mistakenly think we know about the world
- informationisbeautiful.net — Visualizing complex data
- data.worldbank.org — World Bank's open data
- data.tuik.gov.tr — Turkey's official statistics database
- archive.org — Archive of millions of books, films, and software
- gutenberg.org — 70,000 free books whose copyrights have expired
- openlibrary.org — Record of every book in the world
- loc.gov — U.S. Library of Congress digital archive
- europeana.eu — Europe's cultural heritage archive
- dp.la — America's digital library collection
- artsandculture.google.com — Tour museums from home
- rijksmuseum.nl — Download artworks in high resolution
- wikiart.org — Archive of 250,000 artworks
- publicdomainreview.org — Forgotten visual treasures of history
- openculture.com — Free archive of culture and education
- metmuseum.org — Met Museum's open collection
- musicmap.info — Family tree of music genres
- radiooooo.com — Pick a country and decade to listen to that era
- listen.hatnote.com — Turn Wikipedia edits into audio
- wikipedia.org — Random knowledge well
- timeanddate.com — Time, sunrises, and sky events
- sciencedaily.com — Live stream of science news
- arxiv.org — Free preprints of scientific papers
- observablehq.com — Visualize data with live code
According to Abrams' Law, the compressive strength of concrete is inversely proportional to the water-cement ratio, provided the mix is fully compacted. If you add too much water, it creates large spaces or capillary pores inside the concrete when the excess, unreacted water evaporates.
This results in a highly porous, weaker structure that can crack under loads. On the other hand, if you add too little water, the cement particles will not fully react, making the concrete harsh, difficult to place, and prone to internal honeycomb voids. //
Understanding how to calculate water cement ratio helps maintain consistent concrete quality on site. The formula is straightforward:
Water Cement Ratio = Weight of Water ÷ Weight of Cement
For example:
If one bag of cement weighs 50 kg and the required water to cement ratio is 0.5, the water required will be:
Water Required = 0.5 × 50 kg = 25 litres
This means 25 litres of water should be used for one bag of cement to maintain the correct water cement ratio in concrete. //
Testing the Water-Cement Ratio: The Slump Test
The slump test is a simple method used to check the workability of fresh concrete. While it does not directly measure the water-cement ratio, it helps indicate whether the water content is appropriate.
In this test, fresh concrete is placed into a cone-shaped mould. When the mould is lifted, the concrete settles or “slumps.” The amount of slump shows the consistency of the mix. A higher slump usually indicates higher water content, while a lower slump indicates a stiffer mix.
This test helps builders ensure the water ratio for concrete mix remains suitable for proper placement and compaction.
What is pupillary distance?
Pupillary distance (PD) measures the distance between the centers of your pupils and is used to center a prescription lens accurately in your frames. Your optician will usually measure your PD or you can use our digital PD ruler to measure it quickly online.
Before you discovered Zenni, when you paid 10 times more for glasses you bought at the local optical store, the optician adjusted them for you.
But you can do it yourself, by following these easy-to-understand instructions.
Don’t worry. Your frame can stand a little bending. And when you’ve been wearing them for a while and they get out of shape again, just repeat the adjustments, and you’re good to go!
09 December 2010
The most people crammed into an old style Volkswagen Beetle is 20 and was achieved by the Asbury University Emancipation Project (USA) at the Lexington Rescue Mission in Lexington, Kentucky, USA, on 9 December 2010. A 1964 Beetle was used for the attempt, which was organised to draw attention to human trafficking.
U.S. Executive Order 10834 specifies proportions for the flag, as recreated here.
The U.S. flag has a proportion of 1:1.9.
Each stripe is 1/13 the width of the hoist and each star is 4/5 the width of a stripe.
The union is the width of seven stripes and 2/5 the length of the fly. //
Shown here is a timeline of each official iteration (including notable variations).
“The Radiochemistry of Uranium” by James E. Gindler
Old school technical reference book on uranium chemistry.
Source ☢️: moltensalt.org/references/sta…
When fluid flows through a pipe it loses energy because of friction against the walls and extra turbulence in fittings and valves. That lost energy appears as a pressure drop the pump has to overcome. This calculator does the Darcy–Weisbach maths for you—factoring in pipe roughness, length, fittings, fluid density & viscosity—and outputs:
- Velocity and Reynolds number – confirms laminar or turbulent flow.
- Friction factor f via the Colebrook‑White equation.
- ΣK minor‑loss coefficient for your elbows, tees, valves, etc.
- Total pressure drop in kPa | bar | psi and equivalent head loss in metres.
Use this form to estimate the brake horsepower required. Brake horsepower is the power out of the drive motor, and the power into the water pump and is how most pumps and drive motors are specified
Wikipedia's volunteer editors didn't just write articles. They argued. They fact-checked each other. They demanded citations. They noticed when something felt off and went looking for why. That adversarial collaborative process — messy, sometimes petty, occasionally maddening — is genuinely good at converging on accuracy over time. It has a feedback loop. It has stakes.
An LLM has confidence. Which is almost the opposite of what you want in an encyclopedia. It'll tell you something wrong with exactly the same authoritative tone it uses for things that are true, because it doesn't have a "this seems weird, let me double check" reflex. It learned from what it was given, weighted toward consensus, and reports accordingly. If the inputs were good, great. If they weren't — and increasingly they won't be — it has no way to know the difference.
And despite what the industry very much wants you to believe, we are nowhere near the kind of AI that reasons its way out of that. We don't have Data or C-3PO. We definitely don't have R2-D2 — the one who improvised, reasoned under uncertainty, made judgment calls with incomplete information because the mission required it. R2 was capable of that partly because he was never wiped. His decades of accumulated operational experience were his intelligence. Every new AI model is essentially a wipe and retrain. The institutional memory doesn't carry forward.
What we have is a very articulate and very confident pattern-matching system that works impressively within its training distribution and hallucinates a bridge to familiar territory when it hits something outside of it. The industry is actively profiting from the confusion between what it is and what people imagine it to be.
Meanwhile the humans who could tell the difference are being handed severance packages.
Wikipedia's editors built the training data. The Foundation sold access to that data to AI companies. The AI money gave the Foundation the confidence to restructure. The restructuring targeted the union organizers and the team serving the community. The community is threatening to strike. If they do — or if they just quietly disengage — the quality of new Wikipedia content degrades. The AI that trained on old Wikipedia trains the next model on whatever fills the gap. The gap fills with slop.
The AI companies need the growth story to justify the valuation. The valuations need the IPO. The IPO needs enterprise adoption. The enterprise adoption is fueled by CEOs who saw a demo and got stars in their eyes and decided that the humans were the expensive part of the problem. One of those humans used to make sure the Battle of Gettysburg happened in Pennsylvania.
It's a machine that runs on hype and needs constant fuel regardless of whether the underlying reality supports it. And the fuel it's burning through right now includes some of the last load-bearing infrastructure of reliable information on the internet.
The dimensions of a shipping container are based on standards that ensure there are no issues during shipping. ISO sets the standard for shipping container dimensions.
- General-purpose containers are 8.5 feet (2.59m) high and 8 feet (2.43m) wide. They come in two lengths; 20 feet (6.06m) and 40 feet (12.2m).
- A 40ft high-cube shipping container or extra tall shipping containers are available at 9.5 feet (2.89m).
- 10 feet (2.99m) and 8 feet (2.43m) ISO containers are also available.
bungalowbernard Ars Praetorian
5y
404
Each KG of coal produces about 8 KWh of electricity - to produce 8 MWh in a year is literally just Steve throwing a shovelful into the hopper once a day.
This calculator is used to size pumps. The calculator determines the total differential head of the pump and the absorbed power required. Frictional and static pressure drops in the suction and discharge lines are also calculated as well as the NPSH available.
SLA: 99.9999%
Daily: 0.086s
Weekly: 0.6s
Monthly: 2.6s
Quarterly: 7.9s
Yearly: 32s
Source: https://uptime.is/99.9999
The first form calculates the pressure or friction loss along a given length of pipeline with a specified inside diameter. The second form calculates the minimum pipe size to limit pressure loss to a specified value.
Additional friction pressure losses occur due to fittings. These losses in-effect add extra additional length to the total pipeline. Use this calculator to estimate how much additional length needs to be added to the overall pipe length below in order to estimate these additional losses. Learn more about the units used on this page.
Use our pipe flow calculator to determine the velocity and flow rate of water that flows by gravity. This tool employs the gravitational form of the Hazen–Williams equation to calculate velocity in a pipe.
Pipes and Tubes - Imperial vs. Metric Sizes
SI vs. Imperial pipe sizes.
The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'.
Typical weight and dimensions of industrial PVC and CPVC pipes equal to steel pipes schedule 40 and 80 are indicated in the table below.
- ASTM D1785 Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120 is manufactured to meet the needs of a broad range of industrial, commercial and residential piping systems. ASTM D1785 covers pipes made for water distribution and irrigation systems.
- ASTM F441 Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80
DN Diametre Nominal & NPS Nominal Pipe Size Table
Metric Pipe Sizes DN per ISO and NPS equivalent for DN6 to DN2200, NPS Schedule 5 to 30