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On the wallet front, my hope is that biotechnology will replace that. The Co-op in the UK already ran a trail some time ago using fingerprints. The way it works is that a fingerprint reader instore reads your print, you key in your PIN, and if the bank matches them, the purchase goes ahead.
Effectively, your thumb is your credit/debit card.
So, no need to carry anything for that one. Could work for keys, too.
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