In geometry, the grand 600-cell or grand polytetrahedron is a regular star 4-polytope with Schläfli symbol {3,3,5/2}. It is one of 10 regular Schläfli-Hess polytopes. It is the only one with 600 cells. It is one of four regular star 4-polytopes discovered by Ludwig Schläfli. It is named by John Horton Conway, extending the naming system by Arthur Cayley for the Kepler-Poinsot solids. The grand 600-cell can be seen as the four-dimensional analogue of the great icosahedron (which in turn is analogous to the pentagram); both of these are the only regular n-dimensional star polytopes which are derived by performing stellational operations on the pentagonal polytope which has simplectic faces. It can be constructed analogously to the pentagram, its two-dimensional analogue, via the extension of said (n-1)-D simplex faces of the core nD polytope (tetrahedra for the grand 600-cell, equilateral triangles for the great icosahedron, and line segments for the pentagram) until the figure regains regular faces. The Grand 600-cell is also dual to the great grand stellated 120-cell, mirroring the great icosahedron's duality with the great stellated dodecahedron (which in turn is also analogous to the pentagram); all of these are the final stellations of the n-dimensional "dodecahedral-type" pentagonal polytope. (Wikipedia).
HP EliteDesk 800 G4 Mini Guide and Review
See the STH main site article here: https://www.servethehome.com/hp-elitedesk-800-g4-mini-tinyminimicro-guide-review/ Get STH merch on Teespring: https://teespring.com/stores/the-sth-merch-shop The HP EliteDesk 800 G4 Mini is an awesome little ~1L system that packs awesome features includ
From playlist Project TinyMiniMicro
HP EliteDesk 800 G6 Mini Review 1L 65W PC
STH Main Site Article: https://www.servethehome.com/hp-elitedesk-800-g6-mini-65w-review-tmm-more-power/ STH Merch on Spring: https://the-sth-merch-shop.myteespring.co/ STH Top 5 Weekly Newsletter: https://eepurl.com/dryM09 We check out the HP EliteDesk 800 G6 Mini 65W edition to see if th
From playlist Project TinyMiniMicro
HP EliteDesk 800 G3 Mini Project TinyMiniMicro Review
STH Main Site Article: https://www.servethehome.com/hp-elitedesk-800-g3-mini-ce-review-project-tinyminimicro/ STH Merch on (Tee)Spring: https://the-sth-merch-shop.myteespring.co/ STH Top 5 Weekly Newsletter: https://eepurl.com/dryM09 In this installment of Project TinyMiniMicro, we check
From playlist Project TinyMiniMicro
Build Your Own Supercomputer 5 - Testing supercomputer process
Supercomputer Playlist: http://www.youtube.com/watch?v=13x90STvKnQ&list=PLQVvvaa0QuDf9IW-fe6No8SCw-aVnCfRi&feature=share In this part of how to build a supercomputer, we test the MPI and supercomputing technology on a single node. http://seaofbtc.com http://sentdex.com http://hkinsley.co
From playlist Build your Own Supercomputer
Special AMD Ryzen HP EliteDesk 805 G6 Mini 1L PC
We have the HP EliteDesk 805 G6 Mini. This may just be the best AMD Ryzen 4000 series system with more expandability and no AMD PSB vendor-locking like the Lenovo counterparts. STH Main Site Article: https://www.servethehome.com/hp-elitedesk-805-g6-mini-review-a-great-amd-ryzen-1l-pc/ STH
From playlist Project TinyMiniMicro
Building the Largest 555 Timer in the World out of Vacuum Tubes
The 555 Timer is one of the most important and prolific integrated circuits of all time. They’re incredibly cheap, can be sourced from nearly anywhere and work wonderfully. So, let’s make it markedly worse in every single aspect! It’s huge, it consumes a ton of power, it wasn’t cheap by an
From playlist Vacuum Tube Logic
Emulating the Vacuum Tube Computer on the Centurion Minicomputer
Ren14500 has been an absolute legend in working on the Centurion, but Ren actually first reached out to me because he had written an emulator for the vacuum tube computer. It was an epic emulator, but he wrote it such that it could be run on an 80x24 display – which for the keen out there,
From playlist Centurion Minicomputer
Pawn Stars: TOP 7 SUPERHERO ITEMS | History
The Pawn Stars make big-money deals for extremely rare superhero items, in this Pawn Stars compilation. Watch all new episodes of Pawn Stars, Mondays at 9/8c, and stay up to date on all of your favorite The HISTORY Channel shows at http://history.com/schedule. #PawnStars Find out more a
From playlist Pawn Stars: Official Series Playlist | New Episodes Wednesdays at 8/7c | History
Excel Magic Trick 1395: DAX Measures for Show Values As % of Grand Total, Column Total, Parent Total
Download Start File file: https://excelisfun.net/files/EMT1395Start.xlsx Download Finished Excel File: https://excelisfun.net/files/EMT1395Finished.xlsx See how to simulate the Standard PivotTable Show Values As calculations of % of Grand Total, % of Column Total and % of Parent Total. See
From playlist % of Column Totals: Worksheet Formula, PivotTable or Data Model & DAX
Surprising HX90 - AMD Ryzen 9 5900HX Mini PC
We review the AMD Ryzen 9 5900HX mini PC from Minisforum. The Minisforum HX90 brings an 8 core AMD Ryzen CPU and even 2.5GbE (Intel i225) to a mini PC form factor with a catch. It is a bit larger than other mini PCs we have reviewed. STH Main Site Article: https://www.servethehome.com/min
From playlist STH Mini PC
MacBook Battery: Equipment Autopsy #39
In which Chris explores inside a MacBook battery and demonstrates the reactive properties of Lithium.
From playlist Equipment Autopsies
Excel 2010 Statistics 76: Confidence Interval To Estimate Population Proportion: NORM.S.INV Function
Download Excel File: https://people.highline.edu/mgirvin/AllClasses/210Excel2010/Content/Ch08/Busn210ch08.xlsm Download pdf file: https://people.highline.edu/mgirvin/AllClasses/210Excel2010/Content/Ch08/Ch08pdf-Busn210.pdf Two Examples for building Confidence Interval To Estimate Populati
From playlist Excel 2010 Videos
In 2008, Timothy Ray Brown became the first person to be cured of HIV — or so many claim. Brown is known as ‘the Berlin patient’ and six years on, the virus has still not been detected in his blood. In this Nature Video, reporter Lorna Stewart wants to know the implications of his remarkab
From playlist Health
Rudolf Hess: The Last Prisoner of Spandau
Rudolf Hess, the last prisoner in Spandau, Berlin, died in 1987. He had been confined inside since 1947 with six other Nuremberg defendants, but by 1966 he was the last one left in a prison designed for 600. Find out how he ended up in Spandau, how he was guarded by the armed forces of fou
From playlist Hitler Various Subjects
Tesla's Battery Supply Problem
Be one of the first 500 people to sign up with this link and get 20% off your subscription with Brilliant.org! https://brilliant.org/realengineering/ New streaming platform: https://watchnebula.com/ Vlog channel: https://www.youtube.com/channel/UCMet4qY3027v8KjpaDtDx-g Patreon: htt
From playlist Energy
THIS is Dell's 1L TinyMiniMicro Scorcher
We take a look at the Dell OptiPlex 7000 Micro as part of our Project TinyMiniMicro review series. In this video, we see why this is a great step forward with the Intel Alder Lake generation 12 core, 20 thread Intel Core i7-12700 processor. We also compare it to the Dell OptiPlex 7090 Micr
From playlist Project TinyMiniMicro
Peak Smartphone | This Does Not Commute Podcast #34
If almost everyone has a smartphone already, and the pace of progress is slowing...then what? ----------------------------------------------------------------------------- Please consider supporting my work on Patreon: https://www.patreon.com/thisdoesnotcompute Follow me on Twitter and
From playlist Tech Podcasts | This Does Not Commute
Excel Magic Trick 1033: Re-do Duel 134: Join Product and Sub-Product Text Using PivotTable
Download Excel Start File: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT1033.xlsm Download Excel File: http://people.highline.edu/mgirvin/ExcelIsFun.htm Re-do of video: Mr Excel & excelisfun Trick 134: 1. Join Product name and Sub Product name from a two dimensional table by u
From playlist Excel Series: Magic Tricks (6th 200 videos)
Lower Dome Panel opening mechanism for R2-D2 dome. Illustration for my Astromech.net post.
From playlist Building my life-size R2D2