Cool stuff. I used to 'play' regularly with LN2 and LHe back in my grad student days (experimental condensed matter physics). I'm curious how much you paid for

Cool stuff. I used to 'play' regularly with LN2 and LHe back in my grad student days (experimental condensed matter physics). I'm curious how much you paid for the 20 liter dewar. Here in London, just renting a dewar as a one-off and filling with culinary-grade LN2 was amazingly expensive (several hundred pounds). I wanted to do some LN2 demos and also LN2 ice cream at my daughters' party, but instead opted for much simpler and cheaper (and less fun) dry ice.