Num	Answer
1	The IP Header
2	Cantor's Diagonalization, which proves that there are multiple infinities.
3	The Mean Value Theorem
4	Circle of Fifths
5	Origami Crane Base (or Bird Base)
6	Salsa
7	The Penguin Diagram
8	A Flip-Flop
9	A Two-Way Light Switch
10	Cosmic Microwave Background Radiation (Proof of the Big Bang Theory)
11	The SIR model of disease
12	Ammonia
13	A four-stranded braid
14	Glycine
15	The Trefoil Knot
16	Evolution
17	One small step for man, one giant leap for mankind
18	The Laffer Curve
19	Homologous structures (proof of evolution)
20	A color wheel
21	"Braille" in Braille
22	A Bezier curve
23	The 7-4 Hamming code
24	Copernicus' model of the solar system
25	A flush toilet from 1596(!)
26	Napoleon's invasion of , and retreat from Russia
27	How to tell if a toy is for a boy or a girl. (The blue circle says "Do you operate it with your genitalia?", and the orange circle says, "It is for either a boy or a girl."
28	Float like a butterfly, sting like a bee
29	Fishtail braid
30	Phenylalanine
31	Conductor stick motions
32	Instructions for building Stonehenge, in the style of Ikea
33	The standard normal distribution (or bell curve, or Gaussian)
34	The Feigenbaum fractal
35	Guitar chord chart
36	Maslow's hierarchy of needs
37	A bridge rectifier
38	Waltz (or box step)
39	The Boston metro
40	A phase diagram
41	A plot of stars, temperature vs. luminosity
42	The scientific method
43	The Carnot cycle
44	A proof of the Pythagorean Theorem