The US Postal Service just honored the IBM Selectric typewriter and some other icons of American design with their own postage stamps last month, and now Canada Post has gotten in on the act to recognize four key Canadian inventions. That includes the pacemaker, the electric oven, the electric wheelchair and one that's considerably more recent: the BlackBerry. A bit of an ironic choice, perhaps, considering that it could also be seen as contributing to the decline of the postage stamp itself, but Canada Post acknowledges that the "invention freed information workers from their desks and changed
