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Andres Tretiakov

@andrestrujado

Chemist & science enthusiast in a journey of discovery, understanding & learning. I enjoy tinkering & making stuff (sometimes 🐝 keeping) πŸ‘¨β€πŸ”¬

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27.08.2023
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Latest posts by Andres Tretiakov @andrestrujado

Female Samurai

Female Samurai

Fed up working for THE Man? Calling architects and materials experts in Construction who want to explore new ways of building the future without trashing the planet. Diverse applicants welcome. Apply here: www.ucl.ac.uk/work-at-ucl/...

11.03.2026 07:39 πŸ‘ 3 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Materials library

Materials library

We also have PhD scholarships available for UK citizens to work with us as the UCL Plastic Waste Hub. You get to hang out at Institute of Making too which is like enhancing. More info on our general vibe here: UCL Plastic Waste Innovation Hub - Institute of Making share.google/Y2C03GiZgkMO...

11.03.2026 07:46 πŸ‘ 4 πŸ” 7 πŸ’¬ 1 πŸ“Œ 0
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#TECHOGNITION returns THIS FRIDAY 13th March 2026!
Join us in celebrating and showcasing the essential work of school and FE college technical staff.
Huge prizes to be won!
www.techognition.org

09.03.2026 10:31 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Just a preview for next Friday 13th march #TECHOGNITION day! Students & staff will be making Rice Krispies dance πŸ˜‚ #electrostatics @techognition.bsky.social

06.03.2026 11:45 πŸ‘ 2 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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We are just ONE WEEK AWAY from #TECHOGNITION 2026. Will you be joining us in celebrating and showcasing the amazing work of all school and FE college technical staff on Friday 13th March?
Big prizes to be won! techognition.org/prizes-and-g...

06.03.2026 09:41 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Otto Von Guericke's first electrostatic machine using a sulphur sphere.

Otto Von Guericke's first electrostatic machine using a sulphur sphere.

Totally getting ready for #TECHOGNITION day 2026 next week. This is Otto Von Guericke's 1663 first electrostatic machine replica made by my friend Markus. Friday 13th March we'll celebrate with #electrostatics #shocks ⚑& much more... @techognition.bsky.social

04.03.2026 12:44 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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#TECHOGNITION2026 is fast approaching!
Friday 13th March. A celebration of all technicians in schools and colleges in the UK. We make it happen!
This year all about electrostatics ⚑

03.03.2026 17:50 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Ruhmkorff coil & high vacuum. Gassiot's cascade from an upside down uranium glass candle stick.
Ruhmkorff coil & high vacuum. Gassiot's cascade from an upside down uranium glass candle stick. YouTube video by andycapo123

The Gassiot's cascade demo is mesmerising & terrifying at the same time!😬 #physicsdemos
#techniciansRULE
#dischargetubes
#glowinguraniumglass

youtube.com/shorts/OUWA0...

04.02.2026 22:02 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Magical Mercury (family) Andrew Szydlo explores the magic of mercury, looking at ground-breaking discoveries with a whole host of experiments to amaze

A brand-new lecture demo by Andrew Szydlo coming soon at The Royal Institution. Magical Mercury: the wonders of the liquid metal that has fascinated humans since ancient times.
Sat. 21 March 2026 2.30 pm.
www.rigb.org/whats-on/mag...
Just to whet your appetites: www.researchgate.net/publication/...

23.01.2026 16:15 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Let’s sing the praises of science technicians Technician Sarah Keay explains why school science technicians must not be taken for granted

Sing it, say it out loud & shout from the highest structure in your schools!!!
Technician Sarah Keay explains why school science technicians must not be taken for granted edu.rsc.org/opinion/lets...

20.01.2026 21:39 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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In action πŸ‘‡

16.01.2026 15:53 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Sliding bulb on parallel wires and light bulb mystery

Sliding bulb on parallel wires and light bulb mystery

New electrical resistance demos! #Physicsmystery
Thanks to @YeanyScience for the inspiration.

16.01.2026 15:05 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Excerpt from Wikipedia reads: "Fight against merchandising his characters
For years, Watterson battled against pressure from publishers to merchandise his work, something that he felt would cheapen his comic through compromising the act of creation or reading.[21][22]

He refused to merchandise his creations on the grounds that displaying Calvin and Hobbes images on commercially sold mugs, stickers, and T-shirts would devalue the characters and their personalities. Watterson said that Universal kept putting pressure on him and that he had signed his contract without fully perusing it because, as a new artist, he was happy just to find a syndicate willing to give him a chance (two other syndicates had previously turned him down). He added that the contract was so one-sided that, if Universal really wanted to, they could license his characters against his will, and could even fire him and continue Calvin and Hobbes with a new artist. Watterson's position eventually won out, and he was able to renegotiate his contract so that he would receive all rights to his work. Later he said that the licensing fight exhausted him and contributed to the need for a nine-month sabbatical in 1991.[23]"

Excerpt from Wikipedia reads: "Fight against merchandising his characters For years, Watterson battled against pressure from publishers to merchandise his work, something that he felt would cheapen his comic through compromising the act of creation or reading.[21][22] He refused to merchandise his creations on the grounds that displaying Calvin and Hobbes images on commercially sold mugs, stickers, and T-shirts would devalue the characters and their personalities. Watterson said that Universal kept putting pressure on him and that he had signed his contract without fully perusing it because, as a new artist, he was happy just to find a syndicate willing to give him a chance (two other syndicates had previously turned him down). He added that the contract was so one-sided that, if Universal really wanted to, they could license his characters against his will, and could even fire him and continue Calvin and Hobbes with a new artist. Watterson's position eventually won out, and he was able to renegotiate his contract so that he would receive all rights to his work. Later he said that the licensing fight exhausted him and contributed to the need for a nine-month sabbatical in 1991.[23]"

Bill Watterson is my favorite cartoonist. I adored the relationship btw Calvin and Hobbes as a child. But as I've gotten older, these strips feel even more tender and insightful. My respect for him grew when I learned of his stance against merchandising. Such principles are almost unheard of today.

14.01.2026 06:18 πŸ‘ 12238 πŸ” 1534 πŸ’¬ 179 πŸ“Œ 73
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The emission spectrum for deuterium is slightly different. It also emits in the UV region.

13.01.2026 21:50 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
The Wonders of Chemistry with Philip Ball
The Wonders of Chemistry with Philip Ball YouTube video by Beauty of Science

The wonders of Chemistry by @philipcball.bsky.social youtube.com/watch?v=a3Md... #spectacularchem

13.01.2026 21:43 πŸ‘ 13 πŸ” 5 πŸ’¬ 1 πŸ“Œ 1
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Church organ tuning records mirror our warming climate The records appear to reflect climate change, as well as the increased heating of churches in winter

NEW: Organ tuners have been leaving temperature and humidity records in little-known books for decades. 🎹

They reveal how temperatures inside churches have changed over time due to climate change and increased heating.

A new scoop for The Reengineer!

www.thereengineer.pro/p/church-org...

22.12.2025 12:12 πŸ‘ 916 πŸ” 360 πŸ’¬ 7 πŸ“Œ 39
Infographic on how baubles are silvered using silver nitrate solution, concentrated ammonia and glucose solution. Glucose reduces the silver ions to silver metal. The chemical structures of silver nitrate and glucose are shown.

Infographic on how baubles are silvered using silver nitrate solution, concentrated ammonia and glucose solution. Glucose reduces the silver ions to silver metal. The chemical structures of silver nitrate and glucose are shown.

Infographic on wrapping paper and tape. Both are based on cellulose, with tape also containing a pressure-sensitive acrylic or rubber-based adhesive. The structure of cellulose is shown.

Infographic on wrapping paper and tape. Both are based on cellulose, with tape also containing a pressure-sensitive acrylic or rubber-based adhesive. The structure of cellulose is shown.

Decorations and wrapping for day 17 of #ChemAdvent!

Baubles were traditionally silvered using the reduction of silver nitrate with glucose - a chemical test used in classrooms to detect aldehydes.

Wrapping paper and tape are both cellulose-based 🎁

#ChemSky πŸ§ͺ

17.12.2025 11:15 πŸ‘ 40 πŸ” 20 πŸ’¬ 1 πŸ“Œ 0
Hydrogen left & deuterium right  gases being excited in sealed glass ampoules.

Hydrogen left & deuterium right gases being excited in sealed glass ampoules.

Hydrogen left & deuterium right  gases being excited in sealed  glass ampoules.

Hydrogen left & deuterium right gases being excited in sealed glass ampoules.

Low pressure deuterium & hydrogen gases sealed in glass ampoules being excited by a high frequency high voltage supply. Seems to me that the deuterium is brighter than hydrogen. #Deuteriumplasma #TECHOGNITION #chemsky

17.12.2025 09:31 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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13ISMC26 Wednesday 8 July to Friday 10 July 2026

Go to sites.google.com/view/13ismc2....
It's about micro- and small-scale practical activities inspired by the school educators in chemistry around the world. Look at the gallery page! Sign up on the front page. Send a proposal
#chemsky #chemchat #realtimechem #beyondbenign #iTeachChem #Chemistry

06.12.2025 14:10 πŸ‘ 4 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
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Electrifying physics Christmas tree 2025! ⚑ #inductioncoil #neonbulbs
#sciencesky

13.12.2025 16:29 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
3D printed drachma coins & crown painted gold with eureka can, measuring cylinder & beaker.

3D printed drachma coins & crown painted gold with eureka can, measuring cylinder & beaker.

3D printed drachma coins painted with shiny metallic gold marker.

3D printed drachma coins painted with shiny metallic gold marker.

Two years after talking about it, it finally became a reality. The new Archimides density practical for Year 8 was a resounding success. First they needed to determine if the drachma coins were made of gold & then if Hiero's crown was gold or an amalgam of Au & Ag. πŸ‘‘ #Eureka #density #stories

11.12.2025 16:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
The electrifying physics Christmas tree 2025 ⚑ #Highvoltage #physicsdemos #inductioncoil
The electrifying physics Christmas tree 2025 ⚑ #Highvoltage #physicsdemos #inductioncoil YouTube video by andycapo123

A bit of a different Christmas tree this year πŸ˜‰
youtube.com/shorts/BXTsX...
#TECHOGNITION #TechniciansmakeitHappen #sciencetechsRULE

09.12.2025 11:52 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Royal Society Hauksbee Award | Royal Society This award is for outstanding achievements in science by someone whose work is mostly 'behind the scenes' or in support, including technicians, research office staff or other contributors who might no...

Nominations for the Royal Society Hauksbee Award 2026 are now open. Please nominate your invaluable technicians!
Royal Society Hauksbee Award | Royal Society royalsociety.org/medals-and-p...

01.12.2025 17:08 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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111 European Chemists Short biographies of 111 important European chemists, spanning the last three centuries. The biographies focus on their specialist fields of interest, their discoveries and how their work was intercon...

111 European Chemists Ebook launch by Chemistry hero Andrew Szydlo and others! Free to download hereπŸ‘‡Enjoy!
reference-global.com/book/9788367...

10.10.2025 12:39 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Strange behaviour of hydrogel spheres on a hot sheet of metal #Leidenfrosteffect #resonance

02.10.2025 10:47 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Amazingly, Dy3+ doped glass fluoresces yellow under UV light. Xmas tree from 2020 with baubles made of doped Eu3+, Dy3+ & Tb3+

01.10.2025 14:19 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Dysprosium (new) - Periodic Table of Videos
Dysprosium (new) - Periodic Table of Videos YouTube video by Periodic Videos

Dysprosium video:
youtu.be/8TE3iRXVcmY?...

01.10.2025 12:24 πŸ‘ 2 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
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Electrostatic levitation #physicsdemos πŸ‘» #techognition #techsrule

23.09.2025 08:34 πŸ‘ 6 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Transmitting sound via a blinking LED using two 2p coins solar cell
Transmitting sound via a blinking LED using two 2p coins solar cell YouTube video by andycapo123

Radio sound signal modulated via an LED & converted back into sound using a simple solar cell made of two 2p coins submerged in an electrolyte solution & connected to a speaker/amplifier. #physicschemdemos #techognition
youtu.be/YdYFrpJHW7I?...

18.09.2025 18:51 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Glowing gases
Glowing gases YouTube video by andycapo123

Glowing gases! #neonsigns #plasma #highvoltage #excitation #inertgases youtu.be/qAgaPBMNFr8?...

10.09.2025 11:23 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0