Gottfried Wilhelm Leibniz
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50 free Gottfried Wilhelm Leibniz trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Gottfried Wilhelm Leibniz is the kind of figure trivia was made for. He co-invented calculus, designed machines that did arithmetic, advised dukes and a tsar, argued by post with half the great minds of Europe, and still found time for schemes that failed spectacularly. These fun facts about Leibniz are told as questions. They cover his childhood and unusual education, his decades as a courtier in Hanover, the symbols and ideas he gave to mathematics, the philosophy a famous satirist mocked, and the bitter priority quarrel that shadowed his last years. A few ask where his name survives now, from the supermarket shelf to the night sky. The quiz suits students meeting him in a maths or philosophy course, quiz-night regulars, and anyone who enjoys a life with more plot twists than most novels. Every answer comes with a short explanation, so each one is a story worth repeating.
30 of 50 questions with answers and explanations. Play the quiz
Q 01What kind of snack has the Hanover firm Bahlsen sold under Leibniz's name since 1891?
A butter biscuit
A butter biscuit took his name only because Leibniz was one of Hanover's most famous residents. Naming foods after famous figures was in fashion, as with Mozartkugeln.
Q 02Leibniz's geology book Protogaea includes his drawing of the reconstructed skeleton of which mythical creature?
The unicorn
The unicorn he drew was a fanciful rebuild from fossil bones found in the Harz region. Such bones were then ground up and sold as medicine.
Q 03Which English scientist secretly wrote the 1713 committee report that ruled against Leibniz in the calculus dispute?
Isaac Newton
Isaac Newton presided over the very body whose committee judged the quarrel, and he drafted its verdict himself. Historians now accept that both men reached calculus independently.
Q 04What did Leibniz do at age 50, only to change his mind when the answer took too long?
Proposed marriage
Proposed marriage to a woman whose name is lost, then withdrew the offer while she was still deciding. Leibniz stayed single for the rest of his life.
Q 05Which number system, which Leibniz saw as a symbol of God's creation, did he set out in a 1703 paper?
Binary
Binary needs only the digits 0 and 1, which Leibniz read as an image of creation out of the void. Every modern computer now runs on it.
Q 06Leibniz's first paid post, in Nuremberg, was keeping the records of a club devoted to which pursuit?
Alchemy
Alchemy was a subject he knew fairly little about, yet he presented himself as deeply learned and was taken on with a salary.
Q 07Voltaire mocked Leibniz's claim that this is the best of all possible worlds in which 1759 satire?
Candide
Candide drags its naive hero through shipwreck, earthquake and flogging while his tutor insists things could not be better. The caricature shaped how Leibniz was read for generations.
Q 08Leibniz often added which noble particle to his surname, though no record shows he was ever ennobled?
von
Gottfried von Leibniz was how he often introduced himself, yet no document from any government of his day has been found granting him nobility.
Q 09Who was the only member of the Hanover court to attend Leibniz's funeral in 1716?
His secretary
His secretary alone came, because Leibniz had fallen so far from favour that even the king, who was near Hanover, stayed away. The grave lay unmarked for over 50 years.
Q 10Leibniz went to Paris in 1672 hoping to persuade Louis XIV to invade which land and spare Germany?
Egypt
Egypt was his bait to turn French armies away from German soil. The plan went nowhere, though Napoleon's 1798 invasion looks like a late, unwitting version of it.
Q 11In which Saxon city, where his father taught moral philosophy, was Leibniz born in 1646?
Leipzig
Leipzig was also where he entered university at 14, and where the faculty later refused him a doctorate, most likely for being too young.
Q 12Leibniz took his doctorate at the University of Altdorf in which subject, then turned down a professorship there?
Law
Law was the doctorate his home university had refused him, so he moved to Altdorf and submitted a thesis on puzzling court cases within months.
Q 13Which calculus symbol did Leibniz introduce in 1675 as a stretched letter S, short for summa?
The integral sign
The integral sign first appears in his private notes from late 1675, and it is still written the way he drew it.
Q 21Which physicist became Leibniz's mentor in Paris in 1672 and set him on a course of mathematical self-study?
Christiaan Huygens
Christiaan Huygens showed the newcomer how much mathematics he lacked and handed him a reading list. Within about three years the pupil had devised his own calculus.
Q 22Which London body elected Leibniz a fellow in 1673 after he demonstrated his arithmetic machine there?
The Royal Society
The Royal Society saw only a wooden model that February, yet made him a fellow in April. Decades later the same body would rule against him over calculus.
Q 23Which philosopher, author of the then-unpublished Ethics, did Leibniz visit in The Hague in 1676?
Baruch Spinoza
Q 14What was the name of Leibniz's machine, the first able to add, subtract, multiply and divide?
Stepped reckoner
Stepped reckoner was its name, and its fine gearwork outran the craftsmen of the day. One machine lay forgotten in a Göttingen attic until workmen found it in 1876.
Q 15Besides advising on politics, which post did Leibniz hold for the dukes of Brunswick in Hanover and Wolfenbüttel?
Librarian
Librarian was the post that mattered most: the catalogue he devised at Wolfenbüttel became a model for many of Europe's largest book collections.
Q 16What name did Leibniz give to the simple, partless substances that he said make up the whole universe?
Monads
Monads never act on one another, he argued, yet each is like a little mirror of the entire universe, following its own built-in script.
Q 17Leibniz was barred from joining the Hanoverian court in London until he finished which long-overdue project?
A family history
A family history of his employers, the Brunswicks, had been commissioned nearly 30 years before. He combed archives in Germany, Austria and Italy for it and never finished.
Q 18Which ancient Chinese book of hexagrams did Leibniz say matched his arithmetic of ones and zeros?
I Ching
I Ching hexagrams, sent to him by the missionary Joachim Bouvet, run from 000000 to 111111 once broken and solid lines are read as digits.
Q 19Which Russian ruler, who had taken Leibniz on as an adviser, met him again in 1716?
Peter the Great
Peter the Great broke his journey at the spa town of Bad Pyrmont to see him. Leibniz had been following Russian affairs since 1708.
Q 20The series 1 − 1/3 + 1/5 − 1/7 …, named for Leibniz, adds up to a quarter of which constant?
Pi
Pi drops out of this simple pattern of odd fractions, though very slowly. The Indian mathematician Madhava had found the same series centuries before Leibniz did.
Baruch Spinoza spent several days in intense discussion with his visitor and died very soon afterwards. Leibniz admired his intellect but was dismayed by his conclusions.
Q 24Which British king, previously Leibniz's employer as Elector of Hanover, left him behind in Germany in 1714?
George I
George I had little warmth for his court philosopher, and taking him to London would have insulted the English rival seen as the winner of the calculus dispute.
Q 25Which friend and patron of Leibniz died weeks before she would have inherited the British throne?
Electress Sophia
Electress Sophia collapsed in the gardens of Herrenhausen in June 1714, less than two months before Queen Anne died. Her son took the crown instead.
Q 26Leibniz hoped a symbolic language of thought would let people in a dispute sit down together and do what?
Calculate
Calculate was his answer: with ideas written as exact symbols, an error would show at a glance, like a slip in a sum. The dream anticipated symbolic logic.
Q 27Which word did Leibniz coin for the title of his 1710 book defending God's goodness in a world containing evil?
Theodicy
Theodicy joins the Greek for God and justice, and the word now names the whole problem of squaring a good God with suffering.
Q 28To argue that machinery cannot explain perception, Leibniz imagined walking inside a thinking machine as large as what?
A mill
A mill is the image he chose: step inside and you would find only parts pushing one another, never a perception. Philosophers still call the puzzle Leibniz's gap.
Q 29Leibniz's pre-established harmony is often pictured as mind and body agreeing like two matched what?
Clocks
Clocks set going together keep the same time without touching, and Leibniz held that mind and body agree in just that way, synchronised in advance by God.
Q 30Leibniz set out to extend the adding machine of which earlier mathematician so that it could also multiply?
Blaise Pascal
Blaise Pascal had built a device that could only add and subtract. Leibniz learned of it from reading the Pensées and set about making gears multiply and divide too.