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# How many years will it take scientists to invent teleportation device? (answer)

Hi Sun, Let me start by saying very interesting and "outside of the box" question.  Although I don't think many can really give you a precise answer (including myself), I did find an interesting article that you may find interesting.  Take a look at it and let me know what you think about...

# Does the Middle C have a longer or shorter wavelength in water than in air and why? (answer)

So it turns out that there are really only 2 things that affect the velocity of a wave in a medium. The medium's change in shape (elasticity) The medium's change in motion (inertia) This illustrates a pretty interesting concept of wave physics.  Whether a turtle is crawling or a...

# Find the equation of the line that passes through (-6,5) with the slope of (-2/3)? (answer)

Hi Bryan,     This is a really good question!  Not only is it a favorite topic for the algebra regents, but it also tests how comprehensively we understand equations in math.  We have to start off by recalling to memory that a straight line (also called a linear equation) conforms to the...