A few days ago, I cut my left index finger with the back of a knife. How this happened, I do not know. The back of a knife isn’t meant to be sharp. Two blades for the price of one — bonus!

The finger is healing nicely. It’s at that itchy stage, which signals that the body is knitting itself back together.

I have been wondering if this cut has changed my fingerprints. Where do fingerprints come from? What layer of the skin is responsible for these whorls and loops? How deep do I actually need to be cut before there is slash across my fingerprints?

I have some friends who work at London Olympic Park site. The security is tough. You can only get in if your hand print scan matches a print stored in the database.

My friends were telling me about one woman whose hands expand in hot weather and shrink in cold weather. On a cold day like today, she sighs and factors in the extra time it will take to get on to site. Her cold-shrunken hands always fail to pass the security test.

A a man who works at the site has no fingers. This stumps (ha ha) the hand print scanner, so his security clearance is based on a retina scan.

This seems unnecessary to me. Surely a fingerless hand (a palm?) is a unique identifier? Seems much more secure than scanning a common garden-variety fingered hand.