âThis one doesnât have a watermark. It doesnât even have a security thread.â
âWhatâs a security thread?â M.E. asked.
Quinn pulled another bill out of his pocket, thistime a five. He held it up to the light. âThereâs the watermark,â he said, pointing to a faint circle that had been pressed into the bill. âSee that line down the side? Thatâs the security thread.â
âCool!â M.E. said, holding up the bill and examining it. âI never knew that was in there!â
Quinn nodded. âMy dad showed me. I guess itâs only in bills that are worth more than a dollar, because dollar bills donât have them.â
âBut we did find some hidden stuff on the one-dollar bill,â Luke said. âLike this hidden spider.â He pointed to a tiny dot near the number
1
in the upper right corner of the illustration.
âI think it looks like an owl,â Quinn said. âAnd the number
thirteen
is hidden all over the place. See? The eagle on the back is holding thirteen arrows. The branch in its right foot has thirteen leaves. The shield has thirteen stripes, and there are thirteen stars over the eagleâs head. Even the pyramid has thirteen steps.â
âWhy are there so many thirteens?â M.E. asked. âIsnât that supposed to be an unlucky number?â
Quinn shook his head. âOur teacher said it represents the original thirteen colonies.â
âWait a minute!â Cody said, raising her head. Sheâd been studying the back of the one-dollar bill intensely. âCheck out the pyramid. Thereâs an eye at the top, inside a triangle! Just like the one in that picture, M.E.!â
She tapped the photo icon on her phone to retrieve the snapshot sheâd taken of the mysterious drawing. âM.E., get the picture you drew of that triangle/eye.â While M.E. pulled out her drawing, Cody showed the boys the photo of the puzzling artwork. It still had her stumped.
âYouâre right,â Luke said. âIt does look like the same symbol as the one on the dollar bill. What do you think it means?â
âThatâs a good question,â Cody said. She clicked a search engine icon on her phone, then typed in the words
triangle eye.
After reading the information, she looked up at the other Code Busters. âItâs Egyptian!â
âThatâs weird,â M.E. said. âWeâre studyingEgyptian stuff right now. What else does it say?â
âIt says here the symbol is called the All-Seeing Eye of Providence or the Eye of Horus. We learned about that in class. Itâs like a lucky charm thatâs supposed to watch over everyone.â
âThat doesnât tell us much,â Luke said.
âLook up âEye of Horus,â â Quinn said to Cody. âMaybe that will give us more information than what our teachers told us.â
Cody typed in the words, then read from the entry. âIt says, in ancient Egypt, the Eye of Horus was a symbol of protection, power, and good health. They used to make amuletsâjewelryâin the shape of the Eye, and bury them with people to protect them in the afterlife and ward off evil spirits.â
âWow,â M.E. said. âKinda creepy.â
Cody read on. âIt says Horus was a sky god who looked like a falcon and that the eye is supposed to look like a falconâs eye. When Horus got in a fight with another god, his eye got poked out, so he gave it to his dad to save his life.â
âWeird,â Luke said.
âThe Eye of Horus was even used to measure fractions,â Cody added.
âYeah, I remember Ms. Stad told us that Horus was some kind of sky god,â M.E. said.
âHis right eye represented the sun god, Ra,â Cody continued.
âAnd the other eye represented the moon,â Luke added.
âHmm,â M.E. said. âSo the eyes have hidden meanings, sort of like