3) Interaction with Atmosphere:
In general, effect of atmosphere to microwave is quite small. There are absorption and scatter by air, rain, and irregularity of air
refraction ratio. In 2.45 GHz and 5.8 GHz, the absorption by water vapor and oxygen dominate the effect in the air. Especially, it
is enough to consider only absorption by the oxygen in the microwave frequency. It is approximately 0.007 dB/km. In the SPS
case, the amount of total absorption through the air from space is approximately 0.035 dB.

From sand to showpiece

The tallest sandcastle in the world, standing over 21 meters tall, has been built in Denmark.

Although is it a proper sandcastle if they didn't use a giant bucket and spade while fighting off seagulls?

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r/ #interestingasfuck
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