Editing 1911 (section)

=== April ===
{{Main|April 1911}}
* [[April 3]]&nbsp;&ndash; [[Jean Sibelius]] conducts the première of his [[Symphony No. 4 (Sibelius)|Symphony No. 4]], in [[Helsinki]].
* [[April 8]]&nbsp;&ndash; [[Heike Kamerlingh Onnes]] discovers [[superconductivity]]; he presents his findings on [[April 28]].<ref>{{cite journal|author1=van Delft, D.|author2=Kes, P.|title=The discovery of superconductivity|journal=Physics Today|volume=63|issue=9|date=September 2010|pages=38–43|doi=10.1063/1.3490499|bibcode=2010PhT....63i..38V|doi-access=free}}</ref>
* [[April 13]]&nbsp;&ndash; [[Mexican Revolution]]: Rebels take [[Agua Prieta]] on the [[Sonora]]–[[Arizona]] border; government troops take the town back [[April 17]], when the rebel leader "Red" López gets drunk.
* [[April 18]]&nbsp;&ndash; {{SS|Lusitania}}, a 5,557-ton [[Portuguese people|Portuguese]] passenger liner en route from [[Mozambique]] to [[Lisbon]], strikes Bellows Rock just off [[Cape Point]] and sinks.
* [[April 19]]&nbsp;&ndash; [[Mexican Revolution]]: [[Francisco I. Madero]]'s troops besiege [[Ciudad Juárez]], but General Juan J. Navarro refuses his surrender demand.
* [[April 22]]&nbsp;&ndash; A passenger train from [[Port Alfred]] to [[Grahamstown]], South Africa derails on the Blaauwkrantz Bridge, and plunges into the ravine {{convert|200|ft|m|0|abbr=off}} below, killing 31 and seriously injuring 23.<ref name="Holland 1">{{Holland-Vol 1|pages=80–83}}</ref><ref name="SAR History">{{cite book|title=The South African Railways&nbsp;– Historical Survey|editor=Hart, George|publisher=Bill Hart; sponsored by Dorbyl Ltd|date=c. 1978|page=24}}</ref>
* [[April 26]]&nbsp;&ndash; [[HŠK Građanski Zagreb]] (predecessor of [[GNK Dinamo Zagreb]]), a Croatian Association football club, is founded in [[Zagreb]].
* [[April 27]]&nbsp;&ndash; [[Huanghuagang Uprising]]: In China, rebels take five villages in an attempt to create a power base to fight Imperial rule; those who die are remembered as "The 72 Martyrs" (the event is also called the "Second Guangzhou Uprising" and the "Yellow Flower Mound Revolt").