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## Main Question or Discussion Point

From an online book where the author tries to discredit GR, there's a part where he talks about forgetting about the rubber sheet analogy and just remembering:

"A body moves along the path that makes time dilation a minimum."

Then he presents a diagram and a little argument that is really clear. I'm wondering if at least that part is ok or if the whole book is garbage.

Link: [...link deleted by bcrowell...]

I'm curious because I've been struggling for a way to conduct a lesson on GR for 9th graders and this is the simplest explanation I've come across so far (if correct at all). Thanks and sorry if this is taboo to post. I just don't honestly know enough about GR to criticize this properly.

"A body moves along the path that makes time dilation a minimum."

Then he presents a diagram and a little argument that is really clear. I'm wondering if at least that part is ok or if the whole book is garbage.

Link: [...link deleted by bcrowell...]

I'm curious because I've been struggling for a way to conduct a lesson on GR for 9th graders and this is the simplest explanation I've come across so far (if correct at all). Thanks and sorry if this is taboo to post. I just don't honestly know enough about GR to criticize this properly.

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