How many windows are there in New York City?

However you answer this classic interview day curveball, imagine if we devised a way to use each of those windows to convert the sun’s rays into electricity. Whoa.

William Rankine, a noted 19th century Scottish mechanical engineer, would call that an idea with a lot of potential.
Power From Glass
While we (most likely) will never turn every window in NYC into a solar cell, it won’t be because we never tried. Case in point: Researchers fro