PacSci-Doku: “Always There, Never Noticed”

By Dennis Schatz – Senior Advisor

Do you Sudoku? It’s one of the hottest number games around! Well, here’s a twist we think you’ll love. We call it PacSci-Doku. Can you guess why? Here’s how it works. Instead of filling in the blanks with numbers, we use letters. Hidden in one of the columns or rows is the answer to a science question. You’ll find information about the answer on the answer tab below.

The question in this edition is:

What is always there, but you usually never notice it?

To find the answer, complete this PacSci-Doku using the following nine letters:

O  I  T  B  D  P  L  N  S

PacSci-Doku: Always There, Never Noticed

The Puzzle

Puzzle Difficulty: Hard

The Answer

PacSci-Doku: Always There, Never Noticed

The Answer

The question in this edition is:

What is always there, but you usually never notice it?

The answer: Blind Spot

WThe blind spot in your vision is a small spot in each eye where your optic nerve connects to the retina. There are no light receptors at this location, but you don’t usually notice it because your brain fills in the missing information. You can reveal one of the blind spots by putting two dots on a piece of paper about 5 inches apart. Hold the paper about a foot in front of your eyes and look at the right dot with your right eye closed. You will see the left dot disappear because it is focused on the blind spot in your left eye.

Don’t have a piece of paper to draw dots on? Then use this fascinating site to explore finding your blind spots and to see how your brain fills in the missing information.

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