On the number line : 3: can bees count? -- 5: can chickens compute? -- 10: and the name of the rose -- 13: bad luck? -- 42: the answer to everything? -- 91: the numbers on the bone -- 1729: Hardy's taxi -- 119/100: high percentages -- [Pi]: as beautiful as Mona Lisa? -- [Square root]-1: victim of a character assassination -- [Infinite]₀: the end of the number line? -- The never-ending story of prime numbers : Euclid is still right -- How many prime numbers are there? Fermat made a mistake -- The "Mozart of mathematics" makes use of an error -- Another search for errors -- A well-insured million -- The mathematical perspective : Estimates -- Random numbers -- Everything far above average -- Integers -- Caution: equations : Equations for everything? -- The Body Mass Index -- The Huntington affair -- Pythagoras lives -- Equations as art -- The small puzzles : Sudokus -- 3x+1 -- The perfect monster -- The great puzzles -- Where mathematics is created : At the desk -- At the coffee machine -- At the café -- In the computer -- In bed -- In church -- In captivity -- In an attic room in Princeton -- On a beach -- In a paradise with a library -- Knowledge in the ArXiv -- Research in the Internet? -- The book of proofs : About proofs -- Concerning errors -- About computer proofs -- Concerning precision -- Concerning surprises -- Three legends : Mathematician vs. mathematician -- Was it Kovalevskaya's fault? -- The disappearance of Alexander Grothendieck -- What kinds of people are these? : Paul Erdös: traveler -- Gian-Carlo Rota: provocateur -- Persi Diaconis: magician -- Daniel Biss: politician -- Caroline Lasser: colleague -- What mathematicians can do : Self-confidence and visions -- "Unfortunately difficult" vs. "the right stuff" -- Record races -- You know more math that you think -- "Mathematics is ..."