Helmut Krechel
@mrkrechel
Mathematik, Physik, Astronomie, IT, Medienpädagoge, #mebis, Tablet, #OneNote, #geogebra, #Bayernedu #EE, #PV, #Emobility... Born CO2 Level was @ 340 ppm. privat
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24-11-2017 20:04:48
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