diff --git a/🧠-Educational.md b/🧠-Educational.md
index a3619628..9c7f3b7a 100644
--- a/🧠-Educational.md
+++ b/🧠-Educational.md
@@ -118,6 +118,7 @@
 * [media.ccc.de](https://media.ccc.de/) - Educational Presentations
 * [Ted Talks](https://www.ted.com/) - Inspiring and Educational Talks
 * [Stack Exchange](https://stackexchange.com/) or [Quetre](https://quetre.iket.me) - Q&A Communities
+* [ISODN](https://discord.gg/k3zkD2y) - International Science Olympiads Discord Community 
 * [AFAIK](https://afaik.io/) - Learning Map / [Discord](https://discord.gg/mMNwRvWM8s)
 * [Open Educational Resources](https://cdn-infographic.pressidium.com/wp-content/uploads/How-to-Search-for-Open-Educational-Resources-Infographic.jpg) - How to Search for Open Educational Resources
 * [AnimaGraffs](https://animagraffs.com/) - Animated Infographs
@@ -176,7 +177,7 @@
 * ⭐ **[Histography](https://histography.io/)** or [Oldest](https://www.oldest.org/) - History Timelines
 * ⭐ **[MorbidKuriosity](https://morbidkuriosity.com/)** - Dark History, Conspiracies, Crime, Myths, etc.
 * [HistoryMaps](https://history-maps.com/) - Learn History Visually
-* [Smithsonian Institution Archives](https://siarchives.si.edu/) - Historical Photos / Documents
+* [Smithsonian Institution Archives](https://siarchives.si.edu/) or [RareHistoricalPhotos](https://rarehistoricalphotos.com/) - Historical Photos / Documents
 * [Imperial War Museums](https://www.iwm.org.uk/) - Historic War Footage
 * [Museo](https://museo.app/) - Museum Search
 * [Wonderous](https://play.google.com/store/apps/details?id=com.gskinner.flutter.wonders) - Learn About Ancient Structures
@@ -255,7 +256,7 @@
 * [Piano Scribe](https://piano-scribe.glitch.me/) - Piano Transcriber
 * [LilyPond](https://lilypond.org/) - Music Engraving Program
 * [Learning Music](https://learningmusic.ableton.com/) or [Musica](https://www.musicca.com/) - Music-Making Lessons
-* [Piano Trainer](https://zaneh.itch.io/piano-trainer), [Chord Nebula](https://chords.yottanami.com/), [sightread](https://sightread.dev/) or [PianoCheetah](https://pianocheetah.app) - Piano Practice
+* [Midiano](https://midiano.com/) / [Discord](https://discord.com/invite/SfFdbunEm2), [Piano Trainer](https://zaneh.itch.io/piano-trainer), [Chord Nebula](https://chords.yottanami.com/), [sightread](https://sightread.dev/) or [PianoCheetah](https://pianocheetah.app) - Piano Practice / Learning
 * [Keyboard Connect](https://keyboardconnect.com/) - Keyboard Tutoring App
 * [TrueToneGuitar](https://www.truetoneguitar.co.uk/tools/guitar-practice-routine-generator), [Songsterr](https://www.songsterr.com/) / [Premium](https://rentry.co/FMHYBase64#songsterr), [FAChords](https://www.fachords.com/) or [ChordBook](https://chordbook.com/) - Guitar Tools
 * [FretFlip](https://fretflip.com/guitar-scales), [Oolimo](https://www.oolimo.com/en/index.php), [StringScales](https://stringscales.com/), [My Fretboard Trainer](https://myfretboardtrainer.com/home/) or [GuitarScale](https://www.guitarscale.org/) - Learn Guitar Scales / Chords
@@ -425,7 +426,7 @@
 * [Matterport](https://matterport.com/discover) - Explore Real Places Digitally
 * [Hashima Island](https://www.hashima-island.co.uk/) - Hashima Island Virtual Tour
 * [Basilica Viewer](https://virtual.basilicasanpietro.va/en/basilica-viewer/) - St. Peter’s Basilica Tour
-* [360Cities](https://www.360cities.net/) or [Airpano](https://www.airpano.com/) - 360 Images / Videos
+* [360Cities](https://www.360cities.net/), [Zhijianshang](https://www.zhijianshang.com/) or [Airpano](https://www.airpano.com/) - 360 Images / Videos
 * [Smithsonian 3D](https://3d.si.edu/) - Smithsonian 3D Digitization Museum
 * [The Bayeux Tapestry](https://www.bayeuxmuseum.com/en/the-bayeux-tapestry/discover-the-bayeux-tapestry/explore-online/) - Bayeux Tapestry 3D Digitization
 
@@ -448,7 +449,7 @@
 * [QPaths](https://qpaths.deqart.com/) - Learn Basic Quantum Terms
 * [quantum](https://play.google.com/store/apps/details?id=brychta.stepan.quantum_en) - Quantum Physics Learning App
 * [Physics Forums](https://www.physicsforums.com/) - Physics / Science Forum
-* [Physics Olympiads](https://discord.gg/phods) - Physics Discord Community
+* [Physics Olympiads](https://discord.gg/wyGAa49) - ISODN Physics Discord Community
 * [Quantum Web Directory](https://qntm2017.github.io/qntm/OV.html) - Science / Tech / Math / Physics
 * [Virtual-Lab](https://quantumflytrap.com/virtual-lab) - Interactive Quantum Computing Lessons
 * [Interactive 4D Handbook](https://baileysnyder.com/interactive-4d/) - Interactive Fourth Dimension
@@ -526,6 +527,8 @@
 * [Clear Dark Sky](https://cleardarksky.com/) - Star Gazing Weather Forecasts
 * [Dark Site Finder](https://darksitefinder.com/), [DarkSkyMap](https://darkskymap.com/) or [GoStarGazing](https://gostargazing.co.uk/) - Star Gazing Site Locators
 * [TheCMB](http://thecmb.org/) - 3D Cosmic Microwave Background Model
+* [ISODN Astronomy & Astrophysics](https://discord.gg/8DJrk78) - ISODN Astronomy & Astrophysics Discord Community
+* [ISODN Earth Science](https://discord.gg/ujvMHFV) - ISODN Earth Science Discord Community
 
 ***
 
@@ -562,6 +565,7 @@
 * [IXL Learning](https://au.ixl.com/math/) - Math Practice / Quizzes
 * [Pauls Online Math Notes](https://tutorial.math.lamar.edu/) - Math Practice / Guides
 * [ParkMath](https://parkmath.github.io/) or [FreeMathHelp](https://freemathhelp.com/) - Math Guides
+* [ISODN Math](https://discord.gg/3sbwZdh) - ISODN Math Discord Community
 * [Fourier Transform](https://www.jezzamon.com/fourier/index.html) - Interactive Fourier Transform Guide
 * [ProofWiki](https://proofwiki.org/) - Mathematical Proofs Wiki
 * [Terence Tao Research](https://terrytao.wordpress.com/) - Mathematical Research
@@ -630,6 +634,7 @@
 * [IGOC](https://www.chem.ucla.edu/~harding/IGOC/IGOC.html) - Illustrated Glossary of Organic Chemistry
 * [Colorado Chemistry Simulations](https://phet.colorado.edu/en/simulations/filter?subjects=chemistry&type=html%2Cprototype) - Chemistry Animations
 * [Chemical Forums](https://www.chemicalforums.com/) - Chemistry Forums
+* [ISODN Chemistry](https://discord.gg/cf7RN82) - ISODN Chemistry Discord Community
 * [Arkivoc](https://www.arkat-usa.org/) - Journals
 * [WebQC Balance Calculator](https://webqc.org/balance.php) - Chemical Equation Balance Calculator
 * [Chemexper Chemical Directory](https://www.chemexper.com/) - Chemical Directory
@@ -669,6 +674,7 @@
 * [Pteros](https://www.pteros.com/) - Pterosaur Database
 * [WFO](https://www.worldfloraonline.org/) - Plant Database
 * [The Ferns](https://tropical.theferns.info/) - Tropical Plant Database
+* [ISODN Biology](https://discord.gg/AzCQYY7) - ISODN Biology Discord Community
 
 ***
 
@@ -775,6 +781,7 @@
 * [RhinoSpike](https://rhinospike.com/)
 * [LangX](https://Langx.io/)
 * [Polyglot](https://polyglotclub.com/)
+* [ISODN Linguistics](https://discord.gg/8RVtshPPTh) - ISODN Linguistics Discord Community
 
 ***
 
@@ -854,6 +861,7 @@
 * [Train Chinese](https://www.trainchinese.com/), [ChineseSkill](https://www.chineseskill.com/) or [HelloChinese](https://hellochinese.cc/) - Chinese Learning App
 * [KongLongMandarin](https://www.konglongmandarin.com/), [DU Chinese](https://www.duchinese.net/) or [Dong Chinese](https://www.dong-chinese.com/) - Chinese Lessons
 * [ArchChinese](https://www.archchinese.com/) or [Hanzi Grids](https://www.hanzigrids.com/) - Chinese Writing Lessons
+* [Stroke Order](https://stroke-order.learningweb.moe.edu.tw/?la=1) - Learn Chinese Stroke Orders
 * [HackingChinese](https://www.hackingchinese.com/archive-2/) - Chinese Learning Articles
 * [Cantonese.ca](https://cantonese.ca/), [CantoScrolls](https://cantoscrolls.com/), [Laoshi](https://laoshi.io/) or [TofuLearn](https://www.tofulearn.com/) - Chinese Vocabulary
 * [MDBG](https://www.mdbg.net/) or [Pleco](https://play.google.com/store/apps/details?id=com.pleco.chinesesystem) - Chinese Dictionaries
@@ -1200,7 +1208,7 @@
 * [Hacksplaining](https://www.hacksplaining.com/) - Developer Security Lessons
 * [MicroCorruption](https://microcorruption.com/) - Learn Reverse Engineering / Cybersecurity
 * [x86re](https://x86re.com/) or [Reverse-Engineering](https://github.com/mytechnotalent/Reverse-Engineering) - Reverse Engineering Guides
-* [CrackMyApp](https://crackmy.app/) - Reverse Engineering Challenges
+* [CrackMyApp](https://crackmy.app/ or [crackmes](https://crackmes.one/) / [Discord](https://discord.com/invite/2pPV3yq) - Reverse Engineering Challenges
 * [John Hammond](https://www.youtube.com/@_JohnHammond) - Cybersecurity YouTube Tutorials / [Discord](https://j-h.io/discord)
 * [Pentesting Bible](https://github.com/blaCCkHatHacEEkr/PENTESTING-BIBLE) or [Juice Shop](https://owasp.org/www-project-juice-shop/) - Learn Pentesting
 * [How DNS Works](https://howdns.works/) - Learn DNS
@@ -1315,8 +1323,8 @@
 * [/r/APStudents Course Survey](https://docs.google.com/spreadsheets/u/6/d/1s-YM81RvD11h9UOTba_XsBKEy-NW8PEXim2UxSLwdRE/edit#gid=1924688511) - AP Exam Comparison Spreadsheet
 * [/r/CATpreparation](https://www.reddit.com/r/CATpreparation/) - CAT Test Prep / [Discord](https://discord.gg/CAvHUZY6rH)
 * [Revisely](https://www.revisely.com/) - GCSE Exam Help
-* [CatchaScience](https://catchascience.wordpress.com/) or [⁠ZNotes](https://znotes.org/) - IGCSE Study Notes / Resources
-* [IGCSE Papers](https://igcse.net/igcse-past-papers-download/) - Download Past IGCSE Papers
+* [CatchaScience](https://catchascience.wordpress.com/), [IGCSEResources](https://sites.google.com/view/igcseresources/home), [r/IGCSE](https://www.reddit.com/r/igcse/) or [⁠ZNotes](https://znotes.org/) - IGCSE Study Notes / Resources
+* [IGCSE Papers](https://igcse.net/igcse-past-papers-download/) or [Physics & Maths Tutor](https://www.physicsandmathstutor.com/) - Download Past GCSE / IGCSE Papers
 * [IELTS69](https://www.ielts69.com/) - Cambridge Practice Tests
 * [CaieFinder](https://caiefinder.com/) - Previous Cambridge Test Answers
 * [anthropology](https://t.me/anthropology) - UPSC Telegram Channel