Jack Lawrence Links
Youtube Channel/Instagram
Some links from recent videos:
Special Relativity
Simulator (you can run through lots of different scenarios from different perspectives)
Time dilation calculator (plug in different speeds and see what happens comparing observers)
Twin paradox video from TED-ED (this introduces some maths, and length contraction - which goes along with time dilation - but it’s very well done)
Minutephysics Twin Paradox video (also very good, and delightful illustrations)