feat: Dunning Kruger Effect

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diff --git a/README.md b/README.md
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     * [Conway's Law](#conways-law)
     * [Cunningham's Law](#cunninghams-law)
     * [Dunbar's Number](#dunbars-number)
+    * [Dunning-Kruger Effect](#dunning-kruger-effect)
     * [Fitts' Law](#fitts-law)
     * [Gall's Law](#galls-law)
     * [Goodhart's Law](#goodharts-law)
@@ -218,6 +219,21 @@ See also:
 
 - [Conway's Law](#conways-law)
 
+
+### Dunning-Kruger Effect
+
+[Dunning-Kruger Effect on Wikipedia](https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect)
+
+In the field of psychology, the Dunning–Kruger effect is a cognitive bias in which people with low ability at a task overestimate their ability. It is related to the cognitive bias of illusory superiority and comes from the inability of people to recognize their lack of ability. Without the self-awareness of metacognition, people cannot objectively evaluate their competence or incompetence. People experiencing this bias are said to be at the top of "Mount Stupid," (refer to the graph below)-
+
+<img width="500px" alt="Diagram Dunning-Kruger Effect" src="./images/Dunning_Kruger_effect.svg">
+
+The effect suggests that poor performers are usually not in a position to recognize the shortcomings in their performance.
+
+See also:
+* [Impostor syndrome](https://en.wikipedia.org/wiki/Impostor_syndrome)
+* [Illusory superiority](https://en.wikipedia.org/wiki/Illusory_superiority)
+
 ### Fitts' Law
 
 [Fitts' Law on Wikipedia](https://en.wikipedia.org/wiki/Fitts%27s_law)
diff --git a/images/Dunning_Kruger_effect.svg b/images/Dunning_Kruger_effect.svg
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+    <g id="arrowheads" fill="#000" stroke="none">
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+    <!-- THIS APPEARS IN THE GERMAN VERSION OF THIS IMAGE, BUT NOT IN THE ENGLISH VERSION >
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+        <g id="heading" font-size="43">
+            <text x="650" y="86" text-anchor="middle">Dunning–Kruger Effect</text>
+        </g>
+        <g id="axis_labels" font-size="36">
+            <text x="80" y="540" text-anchor="middle" transform="rotate(-90,80,540)">Confidence</text>
+            <text x="710" y="949" text-anchor="middle">Competence</text>
+        </g>
+        <g id="annotations" font-size="28">
+            <text x="154" y="278">Peak of “Mount Stupid”</text>
+            <text x="688" y="554">Slope of Enlightenment</text>
+            <text x="1151" y="238" text-anchor="end">Plateau of Sustainability</text>
+            <text x="366" y="837" text-anchor="middle">Valley of Despair</text>
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+            <text x="1175" y="948" text-anchor="end">Guru</text>
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+            <text x="68" y="878" text-anchor="middle">Low</text>
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