From Cloud Seeds to Lightning-Made Fertilizer

It's counter-intuitive but true that water vapor has a hard time turning into water droplets without a solid or liquid surface to act as a seed.  Once liquified, water droplets can remain in a supercooled state below the freezing point in the absence of crystallization surfaces. The correct term for this "seed" is a cloud condensation nucleus,... Continue Reading →

Why Lawn Grass Is Not Green

From an aesthetic or ecological point of view, a lawn is preferable over concrete, stone and asphalt. The latter trio absorb light energy but then slowly re-radiate as infrared, adding to the heat-island effect of urban areas. Grass instead keeps things cooler. While growing rapidly and absorbing carbon dioxide and water, it invests a fair amount of light energy into the... Continue Reading →

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