E=mc2 or F=ma or (i D - m) v) = 0 or a double helix strand or set theory. All these and more appear in the new book "Science Ink: Tattoos of the Science Obsessed" by Carl Zimmer. My favorite is Entropy. Carnot, a French engineer, wanted to develop a steam engine that was more efficient than the British engines. He found that there will always be a loss of energy that cannot be used. His acceptance of the idea that you cannot build a perfect engine turned into a measurement of disorganization. "In a closed system...entropy always increases. Eggs never unscramble themselves." - pg. 26
Check out this book at your local library.