And I call it an epoxy method because it's not very appetizing. I understand that if you think about epoxy, what's epoxy?

And on day two, we put those two pieces together. That's the epoxy.

Two scientists at University of Illinois understood this when they published a paper on a simpler method for making conductive ink.

Miramontes Luis E. (1961), Process for the production of 3beta hydroxy 16alpha, 17alpha epoxy 5 pregnen 20 one , United States Patent 3004967.

So based on the research by Marcelo Coelho from MIT, Hannah created a series of paper speakers out of a wide range of materials from simple copper tape to conductive fabric and ink.

It was found that Callisto responds to Jupiter's varying background magnetic field like a perfectly conducting sphere that is, the field cannot penetrate inside Callisto, suggesting a layer of highly conductive fluid within it with a thickness of at least 10 km.