![Physics / Light sources / Optical materials / Pinhole camera / Astrophysics / Sun / Window / Eye / Vortices / Plasma physics / Space plasmas Physics / Light sources / Optical materials / Pinhole camera / Astrophysics / Sun / Window / Eye / Vortices / Plasma physics / Space plasmas](/pdf-icon.png) Date: 2015-03-23 09:39:10Physics Light sources Optical materials Pinhole camera Astrophysics Sun Window Eye Vortices Plasma physics Space plasmas | | Build a Safe Sun Viewer Build a safe Sun viewer using cheap household items and learn why it is dangerous to look directly at the Sun, even briefly. Sarah Roberts, UNAWE Age
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