George Jeffreys @GeJeffreys
Humble Math PhD interested in learning science. Joined June 2025-
Tweets114
-
Followers102
-
Following133
-
Likes587
My intention for Crush AP is that colleges stop offering algebra-based physics classes because the incoming freshman already took our course.
0
1
4
818
1
View Details
Conservation of mass in action. Rainwater flows in and gets concentrated into the river channel - more material squashed into a tighter cross-sectional area has only one escape valve: flow faster and faster. Learn more at crushap.com
Once a student understands physics, they often marvel at how easy it is (regardless of the time, energy, or suffering it took them to get to this point).
"Impulse is change in momentum" Actually, impulse is force applied over a time interval. The connection with momentum is a nontrivial consequence of this, not a definition in-and-of itself. Otherwise, why would we even bother giving it a name if it was just p_f - p_i?
3) Write down the list of equations you will potentially need to solve this problem. 4) Begin solving the problem. This process maximizes the chances of being correct every time. If you struggle with physics, try this routine.
Every high school and college physics problem should be tackled in this manner: 1) Rewrite the problem statement using symbols, variables, and such, making sure to express all given quantities (knowns) and the quantity one is searching for (unknowns). 2) Draw a picture.
If you are taking AP Physics I, the most important single skill to practice is matching up a physics problem with the equations you'll need to solve it. Just 'what variables do they give me, what variable am I looking for, what equations match that?'
@AmmarMerhbi The idea that the pictures are the hard part... I could not be more shocked by this.
@Austen They can all do it, it's just that some of them have more creative answers than others.
@palan57 @MichaelPetrilli Honestly, time. When a professor writes a textbook, they go on sabbatical. Creating good course materials while teaching would be an enormous demand on a person's time. Both teaching and writing good teaching materials are too intensive to do either halfway.
The 2% target incentivizes people to invest wealth instead of hoarding it. This is essentially the principle that the world economy is organized around. In particular, even if you don't think it's worth it, it's baked into every financial instution. Meaning, actual deflation would cause massive problems with every single financial institution at once.
@turing_hamster Maybe there's a benefit to seeing a lot of other people/your peers successfully modeling the task you are also currently doing.
@ZyMazza Joke's on them: every ratio is between two integers.
@GrantSlatton I think they deliberately chose to ignore any text with a number in it (maybe with the thinking it would be a url or a proper noun or something that shouldn't be corrected). So, just don't do that and I think you'd be well on your way.
@JoanneLeeJacobs It's funny how counter-intuitive it all is. I mean, if you had to guess ahead of time, you would assume that leveled-reading groups would work great.
@def__ibrahim__ It's okay, we still have Inverse Cramer
@eduleadership Can't help but notice that "no late policy" and "unlimited retakes" both create an enormous amount of logistical overhead
George Jeffreys retweeted
NEW FREE POST The journalist, the federation and the policy of 'isolation' Exclusive Investigation Link 👇
What I would want is some kind of loose framework for a sort of explicit instruction self-study for arbitrary topics. You would never be able to do it properly, but surely it's possible to beat pure unguided reading.
Stephanie James @stephaniejame38
4 Followers 398 Following 🎀 20 · Los Angeles glow · creator brain · dreamy details 🌴
Ryo Leo Iwata @leonardiwata
32 Followers 239 Following Prompting to the void 🌌 | @gauntletai grad (Opinions expressed are my own)
Superbuilders @Superbuilders
441 Followers 74 Following The EdTech team that is on a mission to accelerate and improve educational outcomes for 1 billion kids. @alphaschoolatx
Munawar Shah @munawar2434
210 Followers 1K Following Making AI do my work. I like good UX, self correcting mechanisms and offbeat bets about the future.
🌫️🕯️ @Eqawju90906
177 Followers 7K Following Keep shining, beautiful one. The world needs your light.
Ruby @abliw68999968
0 Followers 136 Following "Enhance your natural beauty with gentle precision and medical expertise."
lily bubury @lilyxberryy
74 Followers 2K Following
Elizabeth Brown @PhonicsMom
3K Followers 1K Following Nonprofit Director / Volunteer Literacy Tutor / Wife / Mom / Child of God
BebetterEnJ @EnBebetter31832
2 Followers 85 Following
Brielle Martins @sassy_mamax2
237 Followers 7K Following ✂️ Quilt maker. TX girl. Mama of magic. Cute chaos and handmade threads daily. 💋
Grace @Grace1988520
104 Followers 2K Following I am an independent filmmaker from Paris, and I enjoy making some unique short films. I once made a short film with a snail as the main character, and I even wo
Brian Moon @perigean
2K Followers 6K Following CTO | @NDMAssn | @VAusability Darwin's People: How Naturalists Explain Our Behavior & The Plot Thinkens @ https://t.co/0DNUGeojEv
Maya @FranklinVirgoP
558 Followers 507 Following In the middle of every difficulty lies opportunity.
Iris Reverie @stealmybae7
890 Followers 4K Following They tried to bury her, but they didn't know she was a seed. Conservatives! Trump supporters! Don't pursue others, just pursue the truth
Alisa Nina @SAnna5434
133 Followers 2K Following I'm a fashion jewelry designer, cryptocurrency enthusiast, and Trump supporter.
Misaki🇺🇸 @zamidesu
400 Followers 127 Following Global Citizen with a suitcase full of stories🌍 Collecting sunsets & friendships worldwide. In love with the ocean 🏝
Hilda Zanaliu @HildaZanaliu
2K Followers 2K Following | Believer ✝️ | Wife | ELD Specialist @troyschools | Learner | Every person needs a place that is furnished with hope. - Maya Angelou - 1 John 4:18
Camille @Simoan0001
571 Followers 576 Following Life is not obligated to meet our expectations, we should accept reality and be thankful that things aren't worse. 🚫 robot ❌ porn
Kanishk Jain @kanishksj01
435 Followers 127 Following Tinkering, Learning. @crushapexams for Alpha School
Sophia @Hawa8222691
10 Followers 252 Following
Alicia DiMatteo @dimatteo_alicia
206 Followers 156 Following Career nanny turned Program Ops for @joingauntletai C1
ibrahim.py @def__ibrahim__
3K Followers 2K Following Building KnightVision. Computer Vision for physical ChessBoards @Jousting_Knight. Transforming OTB Chess for 600 million+ Chess Players.
Sujeet Bhalerao @sujeetbhlr
176 Followers 1K Following Math PhD student at the University of Illinois Urbana-Champaign
Elliot Glazer @ElliotGlazer
5K Followers 793 Following Set theorist and AI math benchmarker. Researches the axiom of choice. Led the development of FrontierMath.
Michael Salter @mikesalter74
2K Followers 892 Following Teacher. Education, classics and linguistics...and music, football, chess and politics occasionally. Also found at https://t.co/OZSplDIODs.
Drew Alexander @DTedifies
1K Followers 1K Following 29. Son. Husband. Father. Servant of Jesus. 8th Grade ELA Teacher. Fatherhood Program Coordinator. Science of Reading Advocate. Mentor. Coffee Enthusiast.
Bob @polyidan
31 Followers 3K Following
Arpan Gupta @arpangup
2K Followers 512 Following I'm building Texas Sports Academy. We're building the best schools in the world for Texas student athletes. DM me if you want to help. @alphaschoolatx
Steven Esmond @misteresmond
69 Followers 462 Following
Babu @Babu95530761
270 Followers 1K Following Infact,Iamverykind,seethestreetbeggingwillalwaysgivemoney,everytimeatthesubwayentranceyouwillalwayseasilytakeovertheleafletsofothers,whentakingacar,seesomeoldpe
Matt Hulme @MattHProgrammer
1K Followers 625 Following CEO @MopacSoftware - Building AI powered Marketing tools | G3 @GauntletAI
reeseys 🏵 ✨ @reeseys
11K Followers 8K Following AI ecosystems • AI Security • Coywolf-American • whitepilled • unconventional • opinions are all my own • technophile • \m/ LICO & RT | ♥️ | follow≠endorsement
GraceAndGrowth @SusannPerrett94
57 Followers 2K Following I’m always interested in new opportunities and collaborations
Siroopor @Siroopor9550
14 Followers 252 Following
Little girl selling f... @seven_0727
33 Followers 537 Following 🏔️🎣🌊 I climb mountains for the view, fish for the patience test, and run to the ocean whenever I need to reset. People say I’m adventurous—I just say I get b
Ebrima @Ebrima441087988
511 Followers 7K Following Father, forgive them; for they know not what they do.✝️✝️
my private page @faith25944N
126 Followers 2K Following
Greta @JwM4XqsUJ10d41
20 Followers 805 Following
Jack Backes @jackwbackes
525 Followers 2K Following (🇺🇸/cath/acc)—Citizen. Father. Data Center expert. Nuclear advocate. Investor in civilization. Ex-LinkedIn. (opinions my own, etc)
REEVEMUSK @jak_serra
134 Followers 6K Following I post my conscious thoughts with the world, live life to the fullest, keep things simple, truthful & filter the noise. I am a long term investor MAGA🚀🇺🇸
REBECCA METTERS @heybeccabuilds
213 Followers 115 Following Founder, Gythr → event infra that doesn't suck. Building in public. Program Experience @GauntletAI. 🖤
NOBUNAGA🇯🇵🏯_... @japan_nobunaga
280K Followers 0 Following Honest perspectives on Japan — culture, traditions, daily life. 本音で語る日本。守るべき文化と伝統。
milton @miltonappl3
4K Followers 653 Following Christian internet pastor for the underserved: Literati, Intelligentsia, Cognoscenti. (I'm Don Quixote but for the Bible & the Western Canon)
Stephen “The Yellow... @schuttsm
5K Followers 2K Following Tech | Faith | History | Economics "I am the man who loves his life"
Crush AP @CrushAPexams
594 Followers 5 Following Crush AP is your roadmap to acing those AP exams in half the time of a typical class. We offer the best AP Physics I course. Used at @AlphaSchool
Superbuilders @Superbuilders
441 Followers 74 Following The EdTech team that is on a mission to accelerate and improve educational outcomes for 1 billion kids. @alphaschoolatx
Peps @PepsMccrea
39K Followers 117 Following Keeping you informed • Director of Education @Steplab_co & author of Evidence Snacks → weekly 5-min email read by 30k+ teachers • edu/acc
Michael Petrilli @MichaelPetrilli
32K Followers 1K Following President of the Thomas B. Fordham Institute; an editor of Education Next; proud father.
Joanne Jacobs @JoanneLeeJacobs
5K Followers 3K Following Education (http://t.co/Czjbxh77SR) blogger, author of Our School.
TigerWallet @TigerWalletESA
12 Followers 1 Following scholarships for K-12 students https://t.co/Wv6MJ0VD5a
Alex Smith @ninja_maths
16K Followers 889 Following Chief content architect @_MathAcademy_ | Math PhD | AKA MathNinja. Developing (possibly) the world's largest online math curriculum.
Audrey Watters @audreywatters
37K Followers 749 Following writer, formerly ed-tech's Cassandra, and Twitter quitter long before it was cool. Mastodon: [email protected] (but not really there either)
Elizabeth Brown @PhonicsMom
3K Followers 1K Following Nonprofit Director / Volunteer Literacy Tutor / Wife / Mom / Child of God
Benn Stancil @bennstancil
8K Followers 296 Following I have a blog | benn.substack I had a job | https://t.co/PPUWbMIeFC Join my professional network | https://t.co/f6QIgfaKSu My janky linktree | https://t.co/5YOf0jrVq6 Fine | https://t.co/OvT9Wq4ata
Niels Hoven 🐮 @NielsHoven
34K Followers 3K Following Founder and CEO of @MentavaInc. Building early literacy software for preschoolers. Help me bring back excellence in education. Father of 4.
Allie K. Miller @alliekmiller
105K Followers 2K Following #1 Most Followed Voice in AI Business (2M followers). Former Amazon, IBM. Time100 AI. Fortune 500 and startup AI advisor, public speaker. AI-First courses in 🔗
Timothy Shanahan @ReadingShanahan
32K Followers 240 Following Timothy Shanahan is Distinguished Professor Emeritus of Education at the University of Illinois at Chicago.
Ben Rice @BenRiceTeach
537 Followers 151 Following Head of Professional Development at Carousel Teaching. Worked in schools for 11 years, most recently as Head of History.
Kanishk Jain @kanishksj01
435 Followers 127 Following Tinkering, Learning. @crushapexams for Alpha School
Tom Dörr @tom_doerr
210K Followers 3K Following Follow for posts about GitHub repos, DSPy, and agents Subscribe for top posts DM to share your AI project (Due to volume of DMs I'll prioritize subscribers)
Alicia DiMatteo @dimatteo_alicia
206 Followers 156 Following Career nanny turned Program Ops for @joingauntletai C1
ibrahim.py @def__ibrahim__
3K Followers 2K Following Building KnightVision. Computer Vision for physical ChessBoards @Jousting_Knight. Transforming OTB Chess for 600 million+ Chess Players.
John Jerrim @JohnPeterJerrim
2K Followers 285 Following
Becky Allen @profbeckyallen
24K Followers 2K Following Recovering academic | co-founder of @teachertapp | now mostly thinking about instruction and learning | yes, I do have a Substack.
FFT Education Datalab @FFTEduDatalab
13K Followers 1K Following FFT Education Datalab produces independent, cutting-edge research on education policy and practice.
Tom Sherrington @teacherhead
148K Followers 5K Following Teaching. CPD @WALKTHRUs_5 podcast https://t.co/FmZAXB80Dw books https://t.co/Z597Id5EBy
Doug Lemov @Doug_Lemov
87K Followers 3K Following Author: Teach Like a Champion (3.0!) TLAC Guide to the Science of Reading Coach's Guide to Teaching Reconnect Most views borrowed from someone smarter.
Stanislas Dehaene @st... @StanDehaene
34K Followers 401 Following Chercheur en neurosciences cognitives
Paul A. Kirschner @P_A_Kirschner
28K Followers 629 Following Educational realist, Diehard edu myth-buster, Emeritus Prof. Educational Psychology Open Universiteit, Guest Prof. Thomas More Uni (Belgium), owner kirschner-ED
Daisy Christodoulou @daisychristo
66K Followers 6K Following Director of Education @nmmarking, an ed tech start-up. Author of 7 Myths about Education, Making Good Progress & Teachers vs Tech. West Ham & cricket fan.
Daniel Willingham @DTWillingham
54K Followers 314 Following Prof @ UVa who's puttin' the funk back in functional brain imaging and the psycho in psychometrics. One study is just one study, folks.
Visible Learning @VisibleLearning
67K Followers 198 Following Visible Learning in collaboration with John Hattie: Professional learning for in-depth and sustainable school & system change. Powered by @CorwinPress
Elliot Glazer @ElliotGlazer
5K Followers 793 Following Set theorist and AI math benchmarker. Researches the axiom of choice. Led the development of FrontierMath.
The Reading League @reading_league
28K Followers 4K Following The Reading League is a nonprofit organization that supports educators and stakeholders as they bring the science of reading to their practice.
Science of Reading Cl... @SoRclassroom
7K Followers 818 Following We share videos, pictures, and work samples from #SoR classrooms! Teachers, please send us yours! Project of @goyenfoundation
Rod @rodjnaquin
4K Followers 5K Following High school English teacher | Exploring dialogue & classroom conversations | Writing about educational practice at https://t.co/8vSPBkOi9U | Music, books
Mme Lockhart @MmeLockhartLDS
17K Followers 4K Following Second Language SpecEd Teacher with Orton-Gillingham Training. Using my M.Ed to bridge gap b/w research &practice. #Dyslexia & #ScienceOfReading advocate🇨🇦
Drew Alexander @DTedifies
1K Followers 1K Following 29. Son. Husband. Father. Servant of Jesus. 8th Grade ELA Teacher. Fatherhood Program Coordinator. Science of Reading Advocate. Mentor. Coffee Enthusiast.
Jason Roberts @exojason
4K Followers 403 Following Founder of @_MathAcademy_. Wrote a lot of the original real-time tech at https://t.co/lYsx2oCHsu.
Bob @polyidan
31 Followers 3K Following
Arpan Gupta @arpangup
2K Followers 512 Following I'm building Texas Sports Academy. We're building the best schools in the world for Texas student athletes. DM me if you want to help. @alphaschoolatx
Frank Nielsen @FrnkNlsn
42K Followers 2K Following Information Geometry, Information Theory, Geometric Science of Information GSI, machine learning, AI, visual computing, HPC, pyBregMan @SonyCSL
AJ @Thisistheaj
427 Followers 276 Following I write the AIs that teach your kids to replace you with AI. currently at @AlphaSchoolATx
Robert Coe @ProfCoe
26K Followers 1K Following Director of Research and Development at Evidence Based Education @EvidenceInEdu; Senior Associate @EducEndowFoundn; Previously Professor of Education at Durham
Greg Ashman @greg_ashman
23K Followers 1K Following School leader. PhD in Instructional Design. Writer. Honorary Fellow. I can speak amusingly about education. Views entirely my own.
Zach Groshell @MrZachG
19K Followers 8K Following Former teacher helping schools implement effective instruction | Progressively Incorrect🎙️ | Director @Steplab_co North America | PhD, Author of Just Tell ThemYou might like
Elon Musk
@elonmusk
240.4M Followers
Barack Obama
@BarackObama
119.3M Followers
Donald J. Trump
@realDonaldTrump
111.7M Followers
Cristiano Ronaldo
@Cristiano
110.2M Followers
Rihanna
@rihanna
97.6M Followers
NASA
@NASA
92.1M Followers
Justin Bieber
@justinbieber
90.8M Followers
Taylor Swift
@taylorswift13
81.3M Followers
Lady Gaga
@ladygaga
72.8M Followers
Kim Kardashian
@KimKardashian
69.7M Followers
Virat Kohli
@imVkohli
69.5M Followers
YouTube
@YouTube
68.7M Followers
Bill Gates
@BillGates
63.7M Followers
Neymar Jr
@neymarjr
62.3M Followers
CNN
@CNN
61.9M Followers
X
@X
60.8M Followers
Selena Gomez
@selenagomez
60.5M Followers
CNN Breaking News
@cnnbrk
59.9M Followers
PMO India
@PMOIndia
58.4M Followers
The New York Times
@nytimes
53.6M Followers