... that French astrochemist Christine Joblin co-created a webcomic to popularize her research on the origins of
cosmic dust? (
23.03)
... that after
Archimedes first defined convex curves, mathematicians lost interest in their analysis until the 19th century, more than two millennia later? (
23.01)
... that ten-sided gaming dice (examples pictured) have kite-shaped faces? (
22.11)
... that it took 90 years to replace the "unconvincing" original proof of Roberts's triangle theorem, on the number of triangles formed by systems of lines, with a correct proof? (
22.11)
... that circle packings in the form of a Doyle spiral(pictured) were used to model plant growth long before their mathematical investigation by Doyle? (
22.10)
... that record-setting airplane spinner Catherine Cavagnaro is also a professional mathematician? (
22.01)
... that Jessen's icosahedron(pictured) has been used for both the "Skwish" children's toy and a NASA proposal for a "super ball bot" to cushion space landers on other planets? (
22.01)
... that dyadic rationals, fractions based on powers of two, can be easier to work with than other kinds of fractions for both schoolchildren and computers? (
21.08)
... that the common depiction of the Borromean rings as three linked but pairwise-unlinked circles (pictured) is an
impossible object, because they cannot actually be circular? (
21.03)
... that although the Euclidean distance and the
Pythagorean theorem are both ancient concepts, the Pythagorean formula for distance was not published until 1731? (
20.12)
... that Laura Garwin, one of the first female
Rhodes Scholars, left a career in science to become a full-time trumpeter? (
20.12)
... that computer science professor Ruth Aylett performed with a robot poet in the Edinburgh
Free Fringe? (
20.12)
... that unlike their Euclidean equivalents, the ideal regular tetrahedron, octahedron, and dodecahedron can all tile
hyperbolic space(pictured)? (
20.10)
... that among proofs of the Sylvester–Gallai theorem,
Kelly's has been praised as "simply the best", but also criticized as "like using a sledge hammer to crack an almond"? (
20.09)
... that Chiara Daraio has used a version of
Newton's cradle to create "sound bullets", and walls filled with ball bearings to create one-way barriers for sound? (
20.03)
... that former college basketball star Amy Langville is an expert in ranking systems, and has applied her ranking expertise to basketball
bracketology? (
20.02)
... that after world-record breaststroke swimmer Gordon Warner lost his left leg, he resumed practising the Japanese
way of the sword and eventually became the discipline's highest-ranked Westerner? (
20.01)
... that J. J. Stiffler's "unparalleled" and "landmark" Theory of Synchronous Communications (1971) sprang from
NASA's need for power-efficient synchronization of data transmission for its
space probes? (
19.09)
... that Pandrosion may have been an earlier female contributor to mathematics than
Hypatia? (
19.09)
... that according to a study conducted by epidemiologist Xifeng Wu and her colleagues, fifteen minutes of moderate exercise per day can increase lifespan by an average of three years? (
19.07)
... that
Fields Medal-winning mathematician Klaus Roth performed so poorly on the
Mathematical Tripos that his tutor suggested he take "some commercial job with a statistical bias"? (
19.05)
... that although the Grünbaum–Rigby configuration(pictured) has been studied since 1879, it was not depicted in its realization as three overlaid
heptagrams until 1990? (
19.05)
... that photographer Evgenia Arbugaeva won the trust of a Siberian mammoth-tusk hunter by stitching up his injured hand? (
18.10)
... that a story by Argentine mathematician Magdalena Mouján about a
Basque family that travels back in time to their homeland was blocked by the
Franco regime? (
18.08)
... that a solar-powered device for extracting water from the air, co-designed by Evelyn Wang, has been compared to the moisture vaporators in Star Wars? (
18.08)
... that Hungarian mathematician Márta Svéd earned her Ph.D. at age 75? (
18.04)
... that prime numbers have been studied since the time of the ancient Greeks, but had few real-world applications until the invention of
public-key cryptography in the 1970s? (
18.04)
... that Emily Riehl, former bassist for the band Unstraight, wrote about "unstraightening" in her research as a professional mathematician? (
18.03)
... that Mary Nomura, a singer who was sent to the
Manzanar concentration camp as an orphaned teenager, became known as the "songbird of Manzanar"? (
18.03)
... that Marjorie Hahn, a retired mathematics professor and international senior-level tennis player, approaches tennis games with the same plan that she uses for mathematical proofs? (
17.12)
... that a play by Babette Hughes was performed in 1938 by six blind actresses? (
17.06)
... that Anne Penfold Street, one of Australia's leading mathematicians, earned bachelor's and master's degrees in chemistry before switching to mathematics? (
17.05)
... that mathematician Donald G. Saari advocates deciding elections by the
Borda count instead of plurality voting, because it leads less often to paradoxical outcomes? (
17.05)
... that the website "Six Degrees to Harry Lewis" (Lewis pictured) was a precursor to Facebook? (
17.04)
... that erection engineer Mark Barr had a business making rubbers, said bicycles stimulated ball development, and was elected to the screw committee? (
17.04)
... that a Bricard octahedron(pictured) can change its shape without changing the shapes of its faces? (
17.03)
... that Euclidean space can be completely filled without overlaps by copies of any plesiohedron, a type of convex shape whose known examples have up to 38 sides? (
17.03)
... that a 1923 book by
Progressive Era activist Kate Claghorn(pictured) has been called "the one significant contemporary study of the immigrant and the American legal system"? (
16.07)
... that Margaret Jarman Hagood, a
sociologist who wrote a book on Mothers of the South, became a mother herself before completing her bachelor's degree? (
16.07)
... that Public Health Reports was established in 1878 to meet the requirements of the National Quarantine Act, which required American consulates abroad to report on epidemic diseases? (
15.09)
... that six or more keys on a keyring can be distinguished from each other by coloring the keys using only two colors (pictured), but rings of fewer keys require more colors? (
15.08)
... that Ioana Dumitriu began taking graduate mathematics courses as a college freshman, and became the first female
Putnam Fellow the following year? (
15.01)
... that mathematician Andrew Gleason liked to say that
proofs "really aren't there to convince you that something is true—they're there to show you why it is true"? (
13.04)
... that Pieter Nieuwland(pictured), an 18th-century child prodigy and
polymath who died a year after becoming a professor, has been called the Dutch
Isaac Newton? (
12.09)
... that
Nicolas de Bruijn was inspired to prove De Bruijn's theorem on packing
bricks into boxes by his seven-year-old son's inability to pack some bricks into a box without wasted space? (
12.09)
... that the number of ways to place diagonally symmetric
rooks on an chessboard in such a way that no two rooks attack each other is a telephone number? (
12.04)
... that the Latvian mathematician Emanuels Grīnbergs lost his job and his doctoral degree for serving in the
German Army during World War II, but then regained both by writing a new thesis? (
12.04)
... that despite leaving school at age 14, Thomas Kirkman became one of 19th-century England's leading mathematicians and helped found
combinatorial design theory? (
11.10)
... that the Malfatti circles, three
tangent circles inside a triangle, are named after
Malfatti because of an incorrect conjecture he made, and were studied earlier by
Ajima and di Cecco? (
11.06)
... that Charles Fletcher, the first European settler in what is now Navarro River Redwoods State Park, built an inn in 1865 that remained open until the 1970s? (
11.02)
... that an equitable coloring of a
graph(pictured), in which the numbers of vertices of each color are as nearly equal as possible, may require far more colors than a
graph coloring without this constraint? (
09.03)
... that there are 115,200 solutions to the ménage problem of
permuting six couples at a twelve-person table so that men and women alternate and are seated away from their partners? (
09.01)
...that in
graph theory, a pseudoforest can contain
trees and pseudotrees, but cannot contain any butterflies, diamonds, handcuffs, or bicycles? (
07.10)
...that a cyclic cellular automaton(pictured) is a system of simple mathematical rules that can generate complex patterns mixing random chaos, blocks of color, and spirals? (
07.04)
... that French astrochemist Christine Joblin co-created a webcomic to popularize her research on the origins of
cosmic dust? (
23.03)
... that after
Archimedes first defined convex curves, mathematicians lost interest in their analysis until the 19th century, more than two millennia later? (
23.01)
... that ten-sided gaming dice (examples pictured) have kite-shaped faces? (
22.11)
... that it took 90 years to replace the "unconvincing" original proof of Roberts's triangle theorem, on the number of triangles formed by systems of lines, with a correct proof? (
22.11)
... that circle packings in the form of a Doyle spiral(pictured) were used to model plant growth long before their mathematical investigation by Doyle? (
22.10)
... that record-setting airplane spinner Catherine Cavagnaro is also a professional mathematician? (
22.01)
... that Jessen's icosahedron(pictured) has been used for both the "Skwish" children's toy and a NASA proposal for a "super ball bot" to cushion space landers on other planets? (
22.01)
... that dyadic rationals, fractions based on powers of two, can be easier to work with than other kinds of fractions for both schoolchildren and computers? (
21.08)
... that the common depiction of the Borromean rings as three linked but pairwise-unlinked circles (pictured) is an
impossible object, because they cannot actually be circular? (
21.03)
... that although the Euclidean distance and the
Pythagorean theorem are both ancient concepts, the Pythagorean formula for distance was not published until 1731? (
20.12)
... that Laura Garwin, one of the first female
Rhodes Scholars, left a career in science to become a full-time trumpeter? (
20.12)
... that computer science professor Ruth Aylett performed with a robot poet in the Edinburgh
Free Fringe? (
20.12)
... that unlike their Euclidean equivalents, the ideal regular tetrahedron, octahedron, and dodecahedron can all tile
hyperbolic space(pictured)? (
20.10)
... that among proofs of the Sylvester–Gallai theorem,
Kelly's has been praised as "simply the best", but also criticized as "like using a sledge hammer to crack an almond"? (
20.09)
... that Chiara Daraio has used a version of
Newton's cradle to create "sound bullets", and walls filled with ball bearings to create one-way barriers for sound? (
20.03)
... that former college basketball star Amy Langville is an expert in ranking systems, and has applied her ranking expertise to basketball
bracketology? (
20.02)
... that after world-record breaststroke swimmer Gordon Warner lost his left leg, he resumed practising the Japanese
way of the sword and eventually became the discipline's highest-ranked Westerner? (
20.01)
... that J. J. Stiffler's "unparalleled" and "landmark" Theory of Synchronous Communications (1971) sprang from
NASA's need for power-efficient synchronization of data transmission for its
space probes? (
19.09)
... that Pandrosion may have been an earlier female contributor to mathematics than
Hypatia? (
19.09)
... that according to a study conducted by epidemiologist Xifeng Wu and her colleagues, fifteen minutes of moderate exercise per day can increase lifespan by an average of three years? (
19.07)
... that
Fields Medal-winning mathematician Klaus Roth performed so poorly on the
Mathematical Tripos that his tutor suggested he take "some commercial job with a statistical bias"? (
19.05)
... that although the Grünbaum–Rigby configuration(pictured) has been studied since 1879, it was not depicted in its realization as three overlaid
heptagrams until 1990? (
19.05)
... that photographer Evgenia Arbugaeva won the trust of a Siberian mammoth-tusk hunter by stitching up his injured hand? (
18.10)
... that a story by Argentine mathematician Magdalena Mouján about a
Basque family that travels back in time to their homeland was blocked by the
Franco regime? (
18.08)
... that a solar-powered device for extracting water from the air, co-designed by Evelyn Wang, has been compared to the moisture vaporators in Star Wars? (
18.08)
... that Hungarian mathematician Márta Svéd earned her Ph.D. at age 75? (
18.04)
... that prime numbers have been studied since the time of the ancient Greeks, but had few real-world applications until the invention of
public-key cryptography in the 1970s? (
18.04)
... that Emily Riehl, former bassist for the band Unstraight, wrote about "unstraightening" in her research as a professional mathematician? (
18.03)
... that Mary Nomura, a singer who was sent to the
Manzanar concentration camp as an orphaned teenager, became known as the "songbird of Manzanar"? (
18.03)
... that Marjorie Hahn, a retired mathematics professor and international senior-level tennis player, approaches tennis games with the same plan that she uses for mathematical proofs? (
17.12)
... that a play by Babette Hughes was performed in 1938 by six blind actresses? (
17.06)
... that Anne Penfold Street, one of Australia's leading mathematicians, earned bachelor's and master's degrees in chemistry before switching to mathematics? (
17.05)
... that mathematician Donald G. Saari advocates deciding elections by the
Borda count instead of plurality voting, because it leads less often to paradoxical outcomes? (
17.05)
... that the website "Six Degrees to Harry Lewis" (Lewis pictured) was a precursor to Facebook? (
17.04)
... that erection engineer Mark Barr had a business making rubbers, said bicycles stimulated ball development, and was elected to the screw committee? (
17.04)
... that a Bricard octahedron(pictured) can change its shape without changing the shapes of its faces? (
17.03)
... that Euclidean space can be completely filled without overlaps by copies of any plesiohedron, a type of convex shape whose known examples have up to 38 sides? (
17.03)
... that a 1923 book by
Progressive Era activist Kate Claghorn(pictured) has been called "the one significant contemporary study of the immigrant and the American legal system"? (
16.07)
... that Margaret Jarman Hagood, a
sociologist who wrote a book on Mothers of the South, became a mother herself before completing her bachelor's degree? (
16.07)
... that Public Health Reports was established in 1878 to meet the requirements of the National Quarantine Act, which required American consulates abroad to report on epidemic diseases? (
15.09)
... that six or more keys on a keyring can be distinguished from each other by coloring the keys using only two colors (pictured), but rings of fewer keys require more colors? (
15.08)
... that Ioana Dumitriu began taking graduate mathematics courses as a college freshman, and became the first female
Putnam Fellow the following year? (
15.01)
... that mathematician Andrew Gleason liked to say that
proofs "really aren't there to convince you that something is true—they're there to show you why it is true"? (
13.04)
... that Pieter Nieuwland(pictured), an 18th-century child prodigy and
polymath who died a year after becoming a professor, has been called the Dutch
Isaac Newton? (
12.09)
... that
Nicolas de Bruijn was inspired to prove De Bruijn's theorem on packing
bricks into boxes by his seven-year-old son's inability to pack some bricks into a box without wasted space? (
12.09)
... that the number of ways to place diagonally symmetric
rooks on an chessboard in such a way that no two rooks attack each other is a telephone number? (
12.04)
... that the Latvian mathematician Emanuels Grīnbergs lost his job and his doctoral degree for serving in the
German Army during World War II, but then regained both by writing a new thesis? (
12.04)
... that despite leaving school at age 14, Thomas Kirkman became one of 19th-century England's leading mathematicians and helped found
combinatorial design theory? (
11.10)
... that the Malfatti circles, three
tangent circles inside a triangle, are named after
Malfatti because of an incorrect conjecture he made, and were studied earlier by
Ajima and di Cecco? (
11.06)
... that Charles Fletcher, the first European settler in what is now Navarro River Redwoods State Park, built an inn in 1865 that remained open until the 1970s? (
11.02)
... that an equitable coloring of a
graph(pictured), in which the numbers of vertices of each color are as nearly equal as possible, may require far more colors than a
graph coloring without this constraint? (
09.03)
... that there are 115,200 solutions to the ménage problem of
permuting six couples at a twelve-person table so that men and women alternate and are seated away from their partners? (
09.01)
...that in
graph theory, a pseudoforest can contain
trees and pseudotrees, but cannot contain any butterflies, diamonds, handcuffs, or bicycles? (
07.10)
...that a cyclic cellular automaton(pictured) is a system of simple mathematical rules that can generate complex patterns mixing random chaos, blocks of color, and spirals? (
07.04)