Aether
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"Chance favors the prepared mind." -- Louis Pasteur
Many discoveries flow from unexpected experimental results. For example, the Cosmic Microwave Background Radiation (CMBR) was first discovered by Penzias & Wilson http://www.pbs.org/wgbh/aso/databank/entries/dp65co.html. However, to make such a discovery "by accident", you would typically need to: 1) measure some sort of signal that reveals a new effect; 2) recognize that the measurement you have made is anomalous; 3) rule out as many known sources of error in your measurement as you can (this can take a long time, and feels like you are "peeling an onion"); and 4) try to find a theoretical explanation...etc..
You can also make discoveries by using "thought experiments" and computer simulations, but it's usually better to mix these in with real experiments if you can.
Many discoveries flow from unexpected experimental results. For example, the Cosmic Microwave Background Radiation (CMBR) was first discovered by Penzias & Wilson http://www.pbs.org/wgbh/aso/databank/entries/dp65co.html. However, to make such a discovery "by accident", you would typically need to: 1) measure some sort of signal that reveals a new effect; 2) recognize that the measurement you have made is anomalous; 3) rule out as many known sources of error in your measurement as you can (this can take a long time, and feels like you are "peeling an onion"); and 4) try to find a theoretical explanation...etc..
You can also make discoveries by using "thought experiments" and computer simulations, but it's usually better to mix these in with real experiments if you can.