diff --git a/index.html b/index.html
index 551b239..d86a7ca 100644
--- a/index.html
+++ b/index.html
@@ -404,7 +404,7 @@ To use in other wikis, drag and drop this link to those wikis: [[Kookma Plugin L
 <div created="20200815145319810" creator="ulaulaman" modified="20200815145609325" modifier="ulaulaman" title="$:/config/SideBar/Visibility/Menu">
 <pre>show</pre>
 </div>
-<div created="20200904194810599" creator="ulaulaman" modified="20210201210706134" modifier="ulaulaman" title="$:/config/Whitespace/search">
+<div created="20200904194810599" creator="ulaulaman" modified="20210212210151854" modifier="ulaulaman" title="$:/config/Whitespace/search">
 <pre>no</pre>
 </div>
 <div created="20200728190149332" creator="ulaulaman" modified="20200728190152217" modifier="ulaulaman" title="$:/config/Whitespace/sidebar">
@@ -11371,10 +11371,10 @@ exports.run = function(tag) {
 <div created="20200728124256197" creator="u" modified="20200728124300028" modifier="ulaulama" title="$:/status/UserName">
 <pre>ulaulaman</pre>
 </div>
-<div created="20210201210428440" creator="ulaulaman" list="[[Gianluigi Filippelli]]" modified="20210201210637982" modifier="ulaulaman" title="$:/StoryList">
+<div created="20210212210122823" creator="ulaulaman" list="[[Gianluigi Filippelli]]" modified="20210212210122823" modifier="ulaulaman" title="$:/StoryList">
 <pre></pre>
 </div>
-<div created="20200904194810600" creator="ulaulaman" modified="20210201210706134" modifier="ulaulaman" title="$:/temp/advancedsearch">
+<div created="20200904194810600" creator="ulaulaman" modified="20210212210151856" modifier="ulaulaman" title="$:/temp/advancedsearch">
 <pre></pre>
 </div>
 <div plugin-type="info" title="$:/temp/info-plugin" type="application/json">
@@ -11748,7 +11748,7 @@ For learning plugin features, syntax, tutorial and examples see the plugin demo
 " requires-reload="no" server-url="https://kookma.github.io/TW-PluginLibrary/library/index.html" source="https://github.com/kookma/TW-Utility" tags="$:/tags/RemoteAssetInfo" title="$:/temp/RemoteAssetInfo/https://kookma.github.io/TW-PluginLibrary/library/index.html/$:/plugins/kookma/utility" type="text/vnd.tiddlywiki" version="2.1.2">
 <pre></pre>
 </div>
-<div created="20200904194735260" creator="ulaulaman" modified="20210201210706135" modifier="ulaulaman" title="$:/temp/search">
+<div created="20200904194735260" creator="ulaulaman" modified="20210212210151856" modifier="ulaulaman" title="$:/temp/search">
 <pre></pre>
 </div>
 <div created="20200824104326780" creator="ulaulaman" modified="20200824104326780" modifier="ulaulaman" tags="$:/tags/ServerConnection" title="$:/temp/ServerConnection/https://kookma.github.io/TW-PluginLibrary/library/index.html" url="https://kookma.github.io/TW-PluginLibrary/library/index.html">
@@ -12398,7 +12398,7 @@ For example the show twitterFollowButton's code use `{{twitterFollowButton||code
 
 {{twitterFollowButton||code}}</pre>
 </div>
-<div created="20200731233656204" creator="ulaulaman" modified="20201130093311998" modifier="ulaulaman" tags="tikzdraw" title="Infographics" type="text/x-markdown">
+<div created="20200731233656204" creator="ulaulaman" modified="20210212210144738" modifier="ulaulaman" tags="tikzdraw" title="Infographics" type="text/x-markdown">
 <pre>| Title | Source | Pdf |
 |:-------------|:------------------|:------|
 | *Come scoprire nuovi pianeti* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/esopianeti.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/pdf/esopianeti.pdf) |
@@ -12409,6 +12409,7 @@ For example the show twitterFollowButton's code use `{{twitterFollowButton||code
 | *Un flyby con Bepi-Colombo* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/mercurio/bepicolombo_flyby.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/mercurio/pdf/bepicolombo_flyby.pdf) |
 | *Le Perseidi* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/perseidi.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/pdf/perseidi.pdf) |
 | *Eclissi di Sole* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/eclissi_sole.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/pdf/eclissi_sole.pdf) |
+| *Un fatto curioso sui semicerchi* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/math/semicerchi.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/math/pdf/semicerchi.pdf) |
 
 ### Fatti e misfatti