In what sense are protist primitive & in what sense are they advanced? You can only upload files of type PNG, JPG or JPEG. 2  You can only upload files of type 3GP, 3GPP, MP4, MOV, AVI, MPG, MPEG or RM. 3  You can only upload photos smaller than 5 MB. 4  You can only upload videos smaller than 600 MB. 5  You can only upload a photo (png, jpg, jpeg) or video (3gp, 3gpp, mp4, mov, avi, mpg, mpeg, rm).
In answer to your question, you can use a Forever stamp, but it won't be enough on its own. The cost of a US Forever stamp is 49 cents, while the cost of a letter to Canada is $1.20. USPS also sells a Global Forever stamp, as others have noted. You can certainly slap one of those on a letter to Canada.
The 2-cent Large Queen, Laid Paper: potentially the most expensive Canadian stamp. (Photograph by Cole Garside) The junk mail in your mailbox is worthless, but a letter from a loved one is priceless. As for the stamps, they might be worth keeping if they are rare enough. We asked John Jamieson, owner of the Saskatoon Stamp Centre and philatelic expert (the collection and study of stamps), for the seven most expensive Canadian stamps.