Embed Notice

Today's April Fool gag, courtesy of an excellent school technician forum:

I stick a small test tube in a large beaker of glycerol. The borosilicate glass and glycerol have the same refractive index, so the test tube is basically invisible.

I explain that I've invented a perfect glue that even puts things back in place, smash a test tube, pour the broken glass in to the beaker (it disappears), stir, and pull out a complete test tube.