Amazon unveils Amazon One, a new biometric technology that allows shoppers to pay using their palm, to be first implemented at two Amazon Go stores in Seattle (Jason Del Rey/Vox)

Jason Del Rey / Vox:
Amazon unveils Amazon One, a new biometric technology that allows shoppers to pay using their palm, to be first implemented at two Amazon Go stores in Seattle  —  And, it hopes, other retailers' stores in the future.  —  SHARE All sharing options  —  Amazon accounts for nearly 40 percent …