The answer to your question would be space. The sun's light travles through space. but if you clap, you can't hear it.
When a new technology is introduced, there is geo-testing performed to see how this new extraction method effects the environment. The over all effects and efficiency are what should determine the acceptance of these solutions.
This is just an educated guess. As the purple pigment, caused by anthocyanins, are on the bottom side of the plant, their purpose could probably be to direct the light.
Specifically, a purple pigment on the bottom of the plant would absorb certain wavelengths near the purple spectrum, and reflect other wavelengths back toward the portion of the plant with chlorophyll. In this way, light does not simply pass through the leaf, instead it is reflected back in towards the chlorophyll to maximize the amount of light being used for photosynthesis.
There is proof of millions of other galaxies, and there is hope for other life, but there is no real knowing of other life in any other galaxy than ours.
It’s painful because when they sing, a chemical is released called melting into the victim. That venom quickly triggers the receptors of pain, and thus causing the burning sensation. Another reason is because the stinger on a bee is barbed and when it sinks into the skin, it detaches from the bee and stays into the skin of the victim.
