The Challenge: Make distilled water from seawater using solar power 
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What is so special
about the parabola shape?
The parabola has a
very well defined mathematical formula. If we draw a graph with the y
axis going up the page, the x axis across the page and ‘a’ being the distance
of the focus from the mirror, the shape of the parabola is plotted out
by the formula y2=4ax and forms a ‘C’ shape.
Using the formula to design a mirror
