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Introduction:

In classical physics, studying the behavior of a physical system is often a simple task due to the fact that several physical qualities can be measured simultaneously. 
Simply put, you &ndash; the observer &ndash; can look at an object and measure its weight, height, its movements &ndash; if it moves, etc. all at the same time. It is there in front of you and does not change. This is simple logic, you would say. And this is also how physics understood the world until the early 20th century, where the Germany physicist Werner Heisenberg in 1927 described that this certainty is absent in the quantum world. When we talk about the behavior of very small particles such as atoms, protons, electrons etc. &ndash; it is not possible to measure both their position and momentum (movement) at the same time, furthermore objects behave differently depending on the observer. 
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Heisenberg proved this trough a number of experiments and mathematical calculations and profs. 
He called this uncertainty the Uncertainty Principle &ndash; or HUP. It can be hard to get your head around this. Not being able to see or touch or even imagine what we talk about, it becomes something very theoretically for ordinary people, but this discovery was the foundation for quantum mechanics/physics, which has paved the way for much modern technology and lead to break through in space research. 
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The Danish physicist, Niels Bohr was a supporter of Heisenberg&rsquo;s theories, which Einstein was not, and the discussion between the two has gone down in history. 
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A very important consequence of the uncertainty principle has been a psychological one &ndash; the world is NOT as certain as we thought &ndash; or said in another way: we can&rsquo;t be certain! This has greatly humbled scientists in their explorations. 
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In this task, you will be introduced to the uncertainty principle and the discussion between Bohr and Einstein. The Bohr&ndash;Einstein debates were a series of public disputes about quantum mechanics between Albert Einstein and Niels Bohr from 1927-1930. Their debates are remembered because of their importance to the philosophy of science. 
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You can study more about quantum theories and their practical use in the study task in The Material World. 
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Directive:

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<ol>
	<li>Start by watching the youtube video by NOVA &ldquo;Probability and Certainty &ndash; Einstein vs Bohr&rdquo;, 2015. &nbsp;</li>
	<li>Read the file: &ldquo;The Uncertainty Principle&rdquo; and the video attached to the article: &ldquo;Quantum mechanics: The uncertainty principle&rdquo;, from <a href="http://chemwiki.ucdavis.edu">http://chemwiki.ucdavis.edu</a>.</li>
	<li>Read the file: &ldquo;Q&amp;A about the significance of The Uncertainty Principle&rdquo;, Anthony Shaufer.</li>
	<li>Read the file: &ldquo;Revisiting the Einstein-Bohr Dialogue&rdquo;, by Don Howard.</li>
	<li>Summarize what you know now about the uncertainty principle and its significance (it is not necessary for you to be able to conduct scientific mathematical profs). Combine this with your existing knowledge and that from other study tasks related to quantum mechanics.</li>
	<li>What role does the uncertainty principle have in our general perception of life? What role does it have in the realm of technology and for our future?</li>
	<li>Comprise your thoughts and opinion to a 1-page answer which you send to your teacher.</li>
</ol>

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