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Cake day: July 1st, 2023

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  • There is no perfect vacuum, even in deep space. In the space of our Solar System, there is on average 5 atoms in every cubic centimeter. In interstellar space, there is on average 1 atom every cubic centimeter. In intergalactic space, there is on average 1 atom every 100 cubic centimeters. It’s a gradient, but much like the perfectly straight lines and flat planes in the original question, perfect vacuum is a theoretical construct that is impossible to achieve in our reality.





  • Just installed one recently. Got $500 back in a rebate from the electric company and will get 30% back in taxes at the end of the year. These incentives alone bring the cost down to an equivalently sized traditional electric water heater. I haven’t had it running long enough to see what the average electric bill reduction will be; however my last bill (and first full one with the new heater) was my cheapest in the 5 years I’ve been here ($125 vs $150 from the same month last year). I don’t expect it will take long to fully pay for itself compared to the highly inefficient 20-year old model it replaced.