If you’ve got some time to scour eBay and $500 sitting around you can build your own liquid nitrogen plant. [Ben Krasnow] figured it all out for you and estimates he can produce a liter of the ...

Break into pieces and store in an airtight container. Special equipment: Silicone dome molds in 1-inch diameter and 2-inch diameter sizes; if using liquid nitrogen, have it in an insulated ...