when the tube fills with oil it becomes fully invisible Submitted by Pedrao_zao t3_11a76qq on February 23, 2023 at 8:02 PM in mildlyinteresting 52 comments 1,585
B15h73k t1_j9qi3au wrote on February 23, 2023 at 9:09 PM Something something index of refraction. Permalink 8
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