Hello Mr Huang and the rest of your team.
Congratulations for the great job you make.
I'm Kontellis George a teacher of Physics at 3rd Lyceum of Mytilini Greece.
I must thank you for the exciting Applets you have. Many topics of my teachings are much easier to teach with them.
I have two questions about EM waves.
1.  When EM waves transport inside an object is E/B equal with 300000000m/s or smaller?
2.  Near the antenna the two fields seem to have a phase difference of 90 but at a long distance their phase difference become zero. Why is that?
Thank you
George Kontellis
kontellis@sch.gr