La firma digitale

Oggi ci siamo divertiti a fare i detective.

Dopo aver preso tutte le impronte digitali della nostra mano sinistra con un tampone per timbri, abbiamo preso anche  l’impronta del pollice dei nostri compagni e le abbiamo osservate con la lente di ingrandimento.

Abbiamo constatato non solo che le impronte digitali di ogni persona differiscono ma anche quelle della nostra mano sono una diversa dall’altra.

Infine abbiamo anche imparato che anche se tutte diverse  possiamo catalogare le impronte in tre tipologie principali: ad arco, ad ansa e a spirale…………e poi via a lavarsi le mani!

 

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Commenti: 9
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