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  3. <title>Scientific American - Math</title>
  4. <link>http://www.scientificamerican.com</link>
  5. <description></description>
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  7. <pubDate>Thu, 07 Mar 2024 20:09:07 GMT</pubDate>
  8. <language>en-us</language>
  9. <copyright>Scientific American, a Division of Springer Nature America, Inc.</copyright>
  10. <itunes:author>Scientific American</itunes:author>
  11. <itunes:owner><itunes:email>multimedia@sciam.com</itunes:email></itunes:owner>
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  13. <title>The Decimal Point Is 150 Years Older than Historians Thought</title>
  14. <link>https://www.scientificamerican.com/article/the-decimal-point-is-150-years-older-than-historians-thought/</link>
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  16. <pubDate>Tue, 20 Feb 2024 19:00:00 GMT</pubDate>
  17. <standfirst>&lt;p&gt;The origin of the decimal point, a powerful calculation tool, has been traced back to a mathematician who lived during the Italian Renaissance&lt;/p&gt;</standfirst>
  18. <description>&lt;p&gt;The origin of the decimal point, a powerful calculation tool, has been traced back to a mathematician who lived during the Italian Renaissance&lt;/p&gt;</description>
  19. <media:content expression="full" fileSize="4166434" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/FFC8044A-4ED7-49DF-8E73A6E8825018B7_source.jpg" width="790">
  20. <media:description type="html"><![CDATA[Astronomer Giovanni Bianchini presenting Emperor Frederick III with his book <em>Tabulae Astrologiae</em>.]]></media:description>
  21. <media:credit><![CDATA[Heritage Image Partnership Ltd/Alamy Stock Photo]]></media:credit>
  22. </media:content><dc:creator>Jo Marchant, Nature magazine</dc:creator><category>Math</category><category>Mathematics</category><category>Social Sciences</category><category>History</category></item>
  23. <item>
  24. <title>The Strangely Serious Implications of Math's 'Ham Sandwich Theorem'</title>
  25. <link>https://www.scientificamerican.com/article/the-strangely-serious-implications-of-maths-ham-sandwich-theorem/</link>
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  27. <pubDate>Sat, 17 Feb 2024 13:00:00 GMT</pubDate>
  28. <standfirst>&lt;p&gt;A simple solution to gerrymandering crumbles when confronted with math&amp;rsquo;s &amp;lsquo;ham sandwich theorem&amp;rsquo;&lt;/p&gt;</standfirst>
  29. <description>&lt;p&gt;A simple solution to gerrymandering crumbles when confronted with math&amp;rsquo;s &amp;lsquo;ham sandwich theorem&amp;rsquo;&lt;/p&gt;</description>
  30. <media:content expression="full" fileSize="4718107" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/29BBE4A7-6BC0-4B6E-885ECB10EBDB9980_source.jpg" width="790">
  32. <media:credit><![CDATA[Miguel Perfectti/Getty Images]]></media:credit>
  33. </media:content><dc:creator>Jack Murtagh</dc:creator><category>Math</category><category>Mathematics</category></item>
  34. <item>
  35. <title>Secret Mathematical Patterns Revealed in Bach's Music</title>
  36. <link>https://www.scientificamerican.com/article/secret-mathematical-patterns-revealed-in-bachs-music/</link>
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  38. <pubDate>Fri, 16 Feb 2024 12:30:00 GMT</pubDate>
  39. <standfirst>&lt;p&gt;Physicists found that the music of Johann Sebastian Bach contains mathematical patterns that help convey information&lt;/p&gt;</standfirst>
  40. <description>&lt;p&gt;Physicists found that the music of Johann Sebastian Bach contains mathematical patterns that help convey information&lt;/p&gt;</description>
  41. <media:content expression="full" fileSize="8474374" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/0E6808B7-A5D7-49E7-A6BD9D173408CD2A_source.jpg" width="790">
  42. <media:description type="html"><![CDATA[Bach's prelude for klavier score.]]></media:description>
  43. <media:credit><![CDATA[PFMphotostock/Getty Images]]></media:credit>
  44. </media:content><dc:creator>Elise Cutts</dc:creator><category>Math</category><category>Mathematics</category><category>Space &amp; Physics</category></item>
  45. <item>
  46. <title>Surreal Numbers Are a Real Thing. Here's How to Make Them</title>
  47. <link>https://www.scientificamerican.com/article/surreal-numbers-are-a-real-thing-heres-how-to-make-them/</link>
  48. <guid isPermaLink="false">B4AA3FA1-DF1D-4860-9A2EB4E8FD3B6BEF</guid>
  49. <pubDate>Wed, 14 Feb 2024 12:00:00 GMT</pubDate>
  50. <standfirst>&lt;p&gt;In the 1970s mathematicians found a simple way to create all numbers, from the infinitely small to infinitely large&lt;/p&gt;</standfirst>
  51. <description>&lt;p&gt;In the 1970s mathematicians found a simple way to create all numbers, from the infinitely small to infinitely large&lt;/p&gt;</description>
  52. <media:content expression="full" fileSize="4070291" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/59F2DEC5-13F7-47B1-B3BB936CE4553C53_source.jpeg" width="790">
  54. <media:credit><![CDATA[Andriy Onufriyenko/Getty Images]]></media:credit>
  55. </media:content><dc:creator>Manon Bischoff</dc:creator><category>Math</category><category>Mathematics</category></item>
  56. <item>
  57. <title>How String Theory Solved Math's Monstrous Moonshine Problem</title>
  58. <link>https://www.scientificamerican.com/article/how-string-theory-solved-maths-monstrous-moonshine-problem/</link>
  59. <guid isPermaLink="false">F7FE78B5-A079-40D3-841A566B23EE4296</guid>
  60. <pubDate>Mon, 05 Feb 2024 13:00:00 GMT</pubDate>
  61. <atom:updated>Mon, 05 Feb 2024 13:38:51 GMT</atom:updated>
  62. <standfirst>&lt;p&gt;A concept from theoretical physics helped confirm the strange connection between two completely different areas of mathematics&lt;/p&gt;</standfirst>
  63. <description>&lt;p&gt;A concept from theoretical physics helped confirm the strange connection between two completely different areas of mathematics&lt;/p&gt;</description>
  64. <media:content expression="full" fileSize="1956298" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/1E94AB0B-7DC0-4695-9EDCD39444D2387A_source.jpeg" width="790">
  66. <media:credit><![CDATA[VladGans/Getty Images]]></media:credit>
  67. </media:content><dc:creator>Manon Bischoff</dc:creator><category>Math</category><category>Mathematics</category></item>
  68. <item>
  69. <title>Scientists Destroy Illusion That Coin Toss Flips Are 50–50</title>
  70. <link>https://www.scientificamerican.com/article/scientists-destroy-illusion-that-coin-toss-flips-are-50-50/</link>
  71. <guid isPermaLink="false">6C40BF3C-CB32-4FB8-B7ED369593FA152B</guid>
  72. <pubDate>Wed, 31 Jan 2024 14:00:00 GMT</pubDate>
  73. <atom:updated>Wed, 21 Feb 2024 18:40:33 GMT</atom:updated>
  74. <standfirst>&lt;p&gt;Researchers go to great lengths to prove a tiny bias in coin flipping&lt;/p&gt;</standfirst>
  75. <description>&lt;p&gt;Researchers go to great lengths to prove a tiny bias in coin flipping&lt;/p&gt;</description>
  76. <media:content expression="full" fileSize="121467" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/3FE9ABC3-2CC3-41D8-AE636C8A1CD61909_source.jpeg" width="790">
  78. <media:credit><![CDATA[Thomas Fuchs]]></media:credit>
  79. </media:content><dc:creator>Shi En Kim</dc:creator><category>Advances</category><category>Math</category><category>Statistics</category></item>
  80. <item>
  81. <title>Tomorrow's Quantum Computers Threaten Today's Secrets. Here's How to Protect Them</title>
  82. <link>https://www.scientificamerican.com/article/tomorrows-quantum-computers-threaten-todays-secrets-heres-how-to-protect-them/</link>
  83. <guid isPermaLink="false">6D44DCD9-5C10-4176-883893A3A017AD21</guid>
  84. <pubDate>Tue, 30 Jan 2024 14:00:00 GMT</pubDate>
  85. <atom:updated>Wed, 21 Feb 2024 18:48:51 GMT</atom:updated>
  86. <standfirst>&lt;p&gt;Researchers are racing to create codes so complex that even quantum computers can&amp;rsquo;t break them&lt;/p&gt;</standfirst>
  87. <description>&lt;p&gt;Researchers are racing to create codes so complex that even quantum computers can&amp;rsquo;t break them&lt;/p&gt;</description>
  88. <media:content expression="full" fileSize="567696" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/5C818745-C8A4-42B2-BC93F8A6BA4429B8_source.jpg" width="790">
  89. <media:description type="html"><![CDATA[A future quantum computer, far more powerful than this one, will be able to break the cryptographic codes that secure our communications.]]></media:description>
  90. <media:credit><![CDATA[Christopher Payne/Esto]]></media:credit>
  91. </media:content><dc:creator>Kelsey Houston-Edwards</dc:creator><category>Features</category><category>Math</category><category>Mathematics</category></item>
  92. <item>
  93. <title>These Numbers Look Random but Aren't, Mathematicians Prove</title>
  94. <link>https://www.scientificamerican.com/article/these-numbers-look-random-but-arent-mathematicians-prove/</link>
  95. <guid isPermaLink="false">482F11DB-6E8E-448F-9536BBC2DF6BF74A</guid>
  96. <pubDate>Tue, 30 Jan 2024 12:00:00 GMT</pubDate>
  97. <atom:updated>Tue, 30 Jan 2024 20:16:54 GMT</atom:updated>
  98. <standfirst>&lt;p&gt;A new mathematical proof helps show whether a sequence of numbers is &amp;ldquo;pseudorandom&amp;rdquo;&lt;/p&gt;</standfirst>
  99. <description>&lt;p&gt;A new mathematical proof helps show whether a sequence of numbers is &amp;ldquo;pseudorandom&amp;rdquo;&lt;/p&gt;</description>
  100. <media:content expression="full" fileSize="986679" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/6284F581-96A1-4D49-9F1B9F22EA328189_source.jpg" width="790">
  102. <media:credit><![CDATA[Talaj/Getty Images]]></media:credit>
  103. </media:content><dc:creator>Christopher Lutsko</dc:creator><category>Math</category><category>Mathematics</category><category>Technology</category></item>
  104. <item>
  105. <title>A Wild Claim about the Powers of Pi Creates a Transcendental Mystery</title>
  106. <link>https://www.scientificamerican.com/article/a-wild-claim-about-the-powers-of-pi-creates-a-transcendental-mystery/</link>
  107. <guid isPermaLink="false">7AB35F17-2CF0-4BE4-8E1E2386DD7C4938</guid>
  108. <pubDate>Wed, 24 Jan 2024 15:00:00 GMT</pubDate>
  109. <atom:updated>Wed, 31 Jan 2024 16:49:02 GMT</atom:updated>
  110. <standfirst>&lt;p&gt;Mathematicians cannot determine whether multiplying pi by itself repeatedly might produce a whole number&lt;/p&gt;</standfirst>
  111. <description>&lt;p&gt;Mathematicians cannot determine whether multiplying pi by itself repeatedly might produce a whole number&lt;/p&gt;</description>
  112. <media:content expression="full" fileSize="744543" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/A9E7FCB1-8D9E-4859-8D46859B3E494654_source.jpeg" width="790">
  114. <media:credit><![CDATA[BeholdingEye/Getty Images]]></media:credit>
  115. </media:content><dc:creator>Manon Bischoff</dc:creator><category>Math</category><category>Mathematics</category></item>
  116. <item>
  117. <title>This Nomadic Eccentric Was the Most Prolific Mathematician in History</title>
  118. <link>https://www.scientificamerican.com/article/this-nomadic-eccentric-was-the-most-prolific-mathematician-in-history/</link>
  119. <guid isPermaLink="false">29A12095-CC39-4F60-80430CB3BF7A4EE1</guid>
  120. <pubDate>Wed, 24 Jan 2024 11:45:00 GMT</pubDate>
  121. <atom:updated>Thu, 25 Jan 2024 22:27:46 GMT</atom:updated>
  122. <standfirst>&lt;p&gt;The bizarre life and legacy of Paul Erd&amp;#337;s, the most prolific mathematician ever&lt;/p&gt;</standfirst>
  123. <description>&lt;p&gt;The bizarre life and legacy of Paul Erd&amp;#337;s, the most prolific mathematician ever&lt;/p&gt;</description>
  124. <media:content expression="full" fileSize="1008863" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/A67123EE-BADE-4F4E-803E2E7838D54AE5_source.jpg" width="790">
  125. <media:description type="html"><![CDATA[Paul Erd&#337;s (<em>left</em>) with his colleagues Arthur Herald Stone and Shizuo Kakutani.]]></media:description>
  126. <media:credit><![CDATA[New York Daily News Archive/NY Daily News via Getty Images]]></media:credit>
  127. </media:content><dc:creator>Jack Murtagh</dc:creator><category>Math</category><category>Mathematics</category><category>Culture</category></item>
  128. <item>
  129. <title>Math Explains Why Your Friends Are More Popular Than You</title>
  130. <link>https://www.scientificamerican.com/article/math-explains-why-your-friends-are-more-popular-than-you/</link>
  131. <guid isPermaLink="false">2A94283A-6FA0-41CA-AF97415B923C3A24</guid>
  132. <pubDate>Thu, 18 Jan 2024 12:30:00 GMT</pubDate>
  133. <standfirst>&lt;p&gt;The inspection paradox makes sense of social networks, long train wait times and why the call center is always busy&amp;nbsp;&lt;/p&gt;</standfirst>
  134. <description>&lt;p&gt;The inspection paradox makes sense of social networks, long train wait times and why the call center is always busy&amp;nbsp;&lt;/p&gt;</description>
  135. <media:content expression="full" fileSize="4256342" height="496" type="image/png" url="https://static.scientificamerican.com/sciam/cache/file/A1E789CC-7BE4-4712-A54A6C5F05192FDF_source.png" width="790">
  137. <media:credit><![CDATA[kali9/Getty Images]]></media:credit>
  138. </media:content><dc:creator>Jack Murtagh</dc:creator><category>Math</category><category>Mathematics</category></item>
  139. <item>
  140. <title>AI Matches the Abilities of the Best Math Olympians</title>
  141. <link>https://www.scientificamerican.com/article/ai-matches-the-abilities-of-the-best-math-olympians/</link>
  142. <guid isPermaLink="false">74903883-26E6-4EB1-B043004221C9EE8D</guid>
  143. <pubDate>Wed, 17 Jan 2024 16:00:00 GMT</pubDate>
  144. <standfirst>&lt;p&gt;Until now computers have failed to solve mathematical problems. But the AI program AlphaGeometry has succeeded in finding proofs for dozens of theorems from the International Mathematical Olympiad&lt;/p&gt;</standfirst>
  145. <description>&lt;p&gt;Until now computers have failed to solve mathematical problems. But the AI program AlphaGeometry has succeeded in finding proofs for dozens of theorems from the International Mathematical Olympiad&lt;/p&gt;</description>
  146. <media:content expression="full" fileSize="934053" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/05A79557-8D94-44A7-AC079DBEE26E663B_source.jpg" width="790">
  148. <media:credit><![CDATA[Iana Kunitsa/Getty Images]]></media:credit>
  149. </media:content><dc:creator>Manon Bischoff</dc:creator><category>Math</category><category>Technology</category><category>Artificial Intelligence</category></item>
  150. <item>
  151. <title>Simple Math Creates Infinite and Bizarre Automorphic Numbers</title>
  152. <link>https://www.scientificamerican.com/article/simple-math-creates-infinite-and-bizarre-automorphic-numbers/</link>
  153. <guid isPermaLink="false">479A69B1-5B3D-47F1-85B76083631D9143</guid>
  154. <pubDate>Thu, 11 Jan 2024 14:00:00 GMT</pubDate>
  155. <atom:updated>Thu, 11 Jan 2024 18:09:10 GMT</atom:updated>
  156. <standfirst>&lt;p&gt;Squaring numbers can have surprising consequences&lt;/p&gt;</standfirst>
  157. <description>&lt;p&gt;Squaring numbers can have surprising consequences&lt;/p&gt;</description>
  158. <media:content expression="full" fileSize="1875342" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/5B151800-36AD-4142-A78E57F7571FB9BE_source.jpg" width="790">
  160. <media:credit><![CDATA[jvphoto/Alamy Stock Photo]]></media:credit>
  161. </media:content><dc:creator>Manon Bischoff</dc:creator><category>Math</category><category>Mathematics</category></item>
  162. <item>
  163. <title>Podcasts of the Year: Cleo, the Mysterious Math Menace</title>
  164. <link>https://www.scientificamerican.com/podcast/episode/podcasts-of-the-year-cleo-the-mysterious-math-menace/</link>
  165. <guid isPermaLink="false">182EC7FC-A21A-40AA-A8DA4E0CEC900B8C</guid>
  166. <pubDate>Fri, 29 Dec 2023 20:55:00 GMT</pubDate>
  167. <atom:updated>Wed, 17 Jan 2024 15:08:40 GMT</atom:updated>
  168. <standfirst>&lt;p&gt;In 2013 a new user named Cleo took an online math forum by storm with unproved answers. Today she&amp;rsquo;s an urban legend. But who was she? A 2023 editor's pick.&amp;nbsp;&lt;/p&gt;</standfirst>
  169. <description>&lt;p&gt;In 2013 a new user named Cleo took an online math forum by storm with unproved answers. Today she&amp;rsquo;s an urban legend. But who was she? A 2023 editor's pick.&amp;nbsp;&lt;/p&gt;</description>
  170. <media:content expression="full" fileSize="4900310" height="496" type="image/gif" url="https://static.scientificamerican.com/sciam/cache/file/C269DE8B-60CB-4EDE-B207704317BDCA21_source.gif" width="790">
  172. <media:credit><![CDATA[<em>Scientific American</em>/Kelso Harper/ Oflu/Getty Images]]></media:credit>
  173. </media:content><dc:creator>Tulika Bose, Allison Parshall, Carin Leong</dc:creator><enclosure length="18507123" type="audio/mpeg" url="http://flex2.acast.com/s/60secondscience/u/www.scientificamerican.com/podcast/podcast.mp3?fileId=C9883629-0E86-48F0-B00A5542976A42A3"/>
  174. <itunes:duration>12:47</itunes:duration>
  175. <itunes:author>Scientific American</itunes:author><category>Math</category><category>Mathematics</category></item>
  176. <item>
  177. <title>Inside Mathematicians' Search for the Mysterious 'Einstein Tile'</title>
  178. <link>https://www.scientificamerican.com/article/inside-mathematicians-search-for-the-mysterious-einstein-tile/</link>
  179. <guid isPermaLink="false">B32CFDD3-BD5D-455E-A0672766EC34CA33</guid>
  180. <pubDate>Fri, 22 Dec 2023 14:00:00 GMT</pubDate>
  181. <atom:updated>Wed, 21 Feb 2024 18:41:09 GMT</atom:updated>
  182. <standfirst>&lt;p&gt;The quest for the einstein tile&amp;mdash;a shape never seen before in mathematics&amp;mdash;turned up even more discoveries than mathematicians counted on&lt;/p&gt;</standfirst>
  183. <description>&lt;p&gt;The quest for the einstein tile&amp;mdash;a shape never seen before in mathematics&amp;mdash;turned up even more discoveries than mathematicians counted on&lt;/p&gt;</description>
  184. <media:content expression="full" fileSize="352085" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/DF60CDD8-7957-4907-B0DB4FEC50B44AAB_source.jpg" width="790">
  186. <media:credit><![CDATA[Miriam Martincic]]></media:credit>
  187. </media:content><dc:creator>Craig S. Kaplan</dc:creator><category>Features</category><category>Math</category><category>Mathematics</category></item>
  188. <item>
  189. <title>The Most Important Unsolved Problem in Computer Science</title>
  190. <link>https://www.scientificamerican.com/article/the-most-important-unsolved-problem-in-computer-science/</link>
  191. <guid isPermaLink="false">A24CBAFC-3300-4C93-87D9CD10537DFE50</guid>
  192. <pubDate>Fri, 22 Dec 2023 13:00:00 GMT</pubDate>
  193. <atom:updated>Thu, 08 Feb 2024 16:48:10 GMT</atom:updated>
  194. <standfirst>&lt;p&gt;Here&amp;rsquo;s a look at the $1-million math problem at the heart of computation&lt;/p&gt;</standfirst>
  195. <description>&lt;p&gt;Here&amp;rsquo;s a look at the $1-million math problem at the heart of computation&lt;/p&gt;</description>
  196. <media:content expression="full" fileSize="1979227" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/A1A10219-993B-4063-B3B7DBFEF8AC75B5_source.jpg" width="790">
  198. <media:credit><![CDATA[alengo/Getty Images]]></media:credit>
  199. </media:content><dc:creator>Jack Murtagh</dc:creator><category>Advances</category><category>Math</category><category>Computing</category></item>
  200. <item>
  201. <title>AI Beats Humans on Unsolved Math Problem</title>
  202. <link>https://www.scientificamerican.com/article/ai-beats-humans-on-unsolved-math-problem/</link>
  203. <guid isPermaLink="false">11BA1242-0CBA-4A10-AB7451C4256FBD55</guid>
  204. <pubDate>Thu, 21 Dec 2023 12:00:00 GMT</pubDate>
  205. <standfirst>&lt;p&gt;Large language model does better than human mathematicians trying to solve combinatorics problems inspired by the card game Set&lt;/p&gt;</standfirst>
  206. <description>&lt;p&gt;Large language model does better than human mathematicians trying to solve combinatorics problems inspired by the card game Set&lt;/p&gt;</description>
  207. <media:content expression="full" fileSize="537049" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/99FFA0B4-ADCF-4D89-B60CC93FBBFFB0E7_source.jpg" width="790">
  208. <media:description type="html"><![CDATA[In the game Set, players must identify combinations of cards based on the shape, colour, shading and number of symbols.]]></media:description>
  209. <media:credit><![CDATA[Valery Voennyy/Alamy Stock Photo]]></media:credit>
  210. </media:content><dc:creator>Davide Castelvecchi, Nature magazine</dc:creator><category>Math</category><category>Technology</category><category>Artificial Intelligence</category></item>
  211. <item>
  212. <title>How Cryptographic 'Secret Sharing' Can Keep Information Safe</title>
  213. <link>https://www.scientificamerican.com/article/how-cryptographic-secret-sharing-can-keep-information-safe/</link>
  214. <guid isPermaLink="false">32806EE0-33BC-4791-A14A7110F0BECF57</guid>
  215. <pubDate>Thu, 07 Dec 2023 14:00:00 GMT</pubDate>
  216. <standfirst>&lt;p&gt;One safe, five sons and betrayal: this principle shows how shared knowledge can protect secrets&amp;mdash;without having to trust anyone&lt;/p&gt;</standfirst>
  217. <description>&lt;p&gt;One safe, five sons and betrayal: this principle shows how shared knowledge can protect secrets&amp;mdash;without having to trust anyone&lt;/p&gt;</description>
  218. <media:content expression="full" fileSize="8487139" height="496" type="image/jpeg" url="https://static.scientificamerican.com/sciam/cache/file/FC2120C8-73D1-487D-8313173AA7EA9638_source.jpg" width="790">
  219. <media:description type="html"><![CDATA[Shamir&rsquo;s Secret Sharing offers a mathematical solution to the dilemma between control and trust.]]></media:description>
  220. <media:credit><![CDATA[Olemedia/Getty Images]]></media:credit>
  221. </media:content><dc:creator>Manon Bischoff</dc:creator><category>Math</category><category>Mathematics</category></item>
  222. </channel>
  223. </rss>

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