Photocopying machines are fairly complicated devices, but the basic principal is pretty simple. tags: Content_Typecopy_machinedark_powderEducationelectrical_chargelenseslight

Weather balloon data show that the tiny particles within plumes of volcanic ash are constantly generating electrical charge, changing the ... tags: ash_plumeselectrical_chargeEyjafjallaj_#246;kull_volcanoScience_MedicineTechnology