Is special relativity relative? Space contraction and time dilation – Science4All #6


So this was the first actual episode on relativity. But only special relativity.

This video is pretty classic and there are a dozen of similar videos on youtube. I did it because I just had to do it. You know… on the way to general relativity. Still, if you have remarks/questions/criticisms… etc, I’d love to hear it!


Science4All on Youtube


For the last six months, I’ve been doing a new series of Youtube videos on my Science4All Youtube channel. Initially, my goal was to, in each video, start from a basic question, and get to a fundamental concept of mathematics or science. Here’s the first video of the series (it was the first, so please be tolerant^^):

Quickly enough though, after the third of fourth video, my personal taste for the big ideas of mathematics and science, rather than fun but non-big-picture facts, has led me to set another goal. Instead, since then, I’ve been establishing the basic tools to have an insight into one of the greatest achievements of the human minds, the theory of general relativity. Clearly, this has got me much more excited about making these videos, and I think you can feel this in this fifth video of the series:

I’ve gone a long way since. By now, as I’m writing this post, the 15th video — the big finale — has just come out. Here it is:

Of course, this last video is very hard to understand if you haven’t watched previous ones. So, every day in the next week, I will repost the videos, with maybe some additional comments.

What I would love is some feedbacks on the videos. I must say that I’m frankly disappointed by the number of views the videos have had so far — only two have reached 1k views — and the lack of comments left on Youtube. In particular, I’ve been very impressed and inspired by the PBS Space Time series that, amusingly, set itself the same challenge as I did, namely, explaining general relativity through a collection of build-up videos. Gabe (and now Matt) picks up interesting questions and remarks of the Youtube comment section and reply to them in the follow-up videos (both are actual astrophysicists, so they can actually give in-depth replies to tricky questions… which I cannot!). As well, I’ve recently discovered the channel Looking Glass Universe, where “she” (I don’t know her name…) actually gives “homework” in the videos, and gets a lot of replies.

Since I don’t seem to have enough viewers so far to do so, maybe here would be a good place to start. Tell me what you think!