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Research by dhaffnersr 267 research notes and wiki edits starting over 1 year ago













Build Instructions For The DH 4.0 v4 Spectrometer

by dhaffnersr 8 months ago | 0 | 473 | 0

[![DH_spectrometer_sept_3_view_2.png](//i.publiclab.org/system/images/photos/000/017/906/lar...

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Question: Is Global Warming primarily man-made or a natural occurring phenomena?

by dhaffnersr 8 months ago | 2 | 436 | 0

My personal opinion on this subject is that, there has always been warming and cooling trends on ...

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