Imagine holding a letter in your hand that has not been read in over 300 years. A letter that was meant for someone, folded carefully like a mystery, sealed shut, and then simply forgotten.

Preschool Letter Crafts Using Paper Plates. Learning the alphabet is so much fun with this series of paper plate crafts that celebrate each letter of the alphabet. Preschoolers lo ...

In it were a cache of letters including 577 never-opened letterpackets, and the x-ray technique promised a means to analyse these without compromising them. A letter imaged using the technique.