How do you explain the twin paradox to a friend

GSwindle
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How do you explain the "twin paradox" to a friend

Talking with a friend at work I encountered a problem, "No, he was wrong. There is no way possiable that someone can age at a diffrent rate because they are moving at a diffrent speed." We all know a person that has said this and have spent a lot more time than perhaps one would like to get over that initial classical thinking. I would like to know how everyone likes to explain the "twin paradox" to someone who is interested but is stuck in a world of falling apples and cars that only move at 55mph.
 
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Twin Paradox Resolution

There are subtleties in the twin paradox that can't be avoided unless you're competent in high school algebra and can follow carefully stated mathematical reasoning, line by line. I only know of one paper that properly resolves the "twin paradox." It is carefully detailed and is written by a mathematician. Let me know if you have any questions. http://www.everythingimportant.org/relativity/
 
continue the discussion in the other thread
 
Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
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Thread 'Relativator (Circular Slide-Rule): Simulated with Desmos - Insight'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. The Relativator was sold by (as printed) Atomic Laboratories, Inc. 3086 Claremont Ave, Berkeley 5, California , which seems to be a division of Cenco Instruments (Central Scientific Company)... Source: https://www.physicsforums.com/insights/relativator-circular-slide-rule-simulated-with-desmos/ by @robphy
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Thread 'A sufficient condition for integrability of equation ##\nabla g=0##'

In Philippe G. Ciarlet's book 'An introduction to differential geometry', He gives the integrability conditions of the differential equations like this: $$ \partial_{i} F_{lj}=L^p_{ij} F_{lp},\,\,\,F_{ij}(x_0)=F^0_{ij}. $$ The integrability conditions for the existence of a global solution ##F_{lj}## is: $$ R^i_{jkl}\equiv\partial_k L^i_{jl}-\partial_l L^i_{jk}+L^h_{jl} L^i_{hk}-L^h_{jk} L^i_{hl}=0 $$ Then from the equation: $$\nabla_b e_a= \Gamma^c_{ab} e_c$$ Using cartesian basis ## e_I...
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