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What do pills, tattoos and eyeballs have in common?

Answer: They can all be passwords.

PayPal is now developing technology to allow its users access their accounts by taking a pill and using the subsequent signal that emanates as a form of authentication. Motorola announced similar technology in 2013. By taking a pill, the user becomes an authentication beacon, emitting a unique 18-bit password. Other possible replacements to the password include tattoos and retinal scans.

Perhaps someday all three of these will be options for users, as PayPal advertises that the company seeks “true integration with the human body.”