cover from the USA

On 22nd September I got not only three postcards but also a cover from the USA. 

The cover was sent my the American Philatelic Society. Five very nice stamps were used. I especially like the ones about Albert Einstein and the Sesame Street. 

In the cover were two FDCs that were sent out for free during an online philatelic event. One bears a stamp about Innovation, the other a Thank You stamp. Both stamps were printed with special effects.

Thank You very much American Philatelic Society!