Dwoada no, abɔdeɛ mu nimdefoɔ a wɔfiri Stanford University School of Medicine de too dwa sɛ wɔayɛ nhwehwɛmu afidie foforɔ bi a ɛtumi kyɛ nkwammoa mu akuokuo: kyiipo ketewa pa ara bi a wotumi kunkyire gu krataa so a wobɛtumi de inkjet mfidie a yɛde kunkyire nneɛma ayɛ a koro biara boɔ bɛyɛ sɛ 1 U.S cent.