Relativity fun!

Applets worth your time:

http://chair.pa.msu.edu/applets/travel/a.htm

http://www.its.caltech.edu/~phys1/java/phys1/Einstein/Einstein.html

https://parkscience.pbworks.com/w/page/43576403/Modern%20Physics%202011
See the video.

http://physics.ucsc.edu/~snof/Tutorial/index.html
Work through the tutorial, if you like.

http://www.kcvs.ca/site/projects/specialRelativity.html

http://physics.ucsc.edu/~snof/Rally/index.html
http://physics.ucsc.edu/~snof/Game/index.html
Games?