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Cake day: June 24th, 2023

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  • A banana naturally has has around 15 Bq of potassium 40. Assuming a volume of 100 mL, mashed bananas have around 400 Bq/L.

    Currently, the treated water has around 250 Bq/L, around a fifth of mashed bananas. In other words, a banana smoothie could easily be more radioactive then the water as it was released.

    The banana’s potassium 40 has a half life of more then a billion years, so it’s not going anywhere, unlike the tritium who’s amount will half every 11 years. Also, potassium is concentrated by many plants and animals, while tritium is not.






  • The TV will try and amplify and display any signal. Without a station, it will end up amplifying random radio noise and tiny fluctuations in the amplifier circuits themselves.

    The momentary signal strength is interpreted as brightness of a spot which is rapidly scanned over the display. In this case the signal is random so every spot on the screen will be a random brightness, changing every frame.

    Modern digital TVs won’t do this, because with compressed video recognizable data is needed to even attempt displaying a picture.

    As for the sources of the radio noise, most of it is from electrons being jostled by heat, some from space. (Including the cosmic microwave background others have mentioned)

    The electron jostling (thermal noise) is the reason the receivers on radio telescope as cooled to insanely low temperatures often with liquid helium.








  • CO2 emissions are not the only problem with burning things for power. Air polution causes an estimated 3.6 million deaths annualy (thats like world war 2 every 20 years), with the bulk of those (2.1 million) being caused just by ultrafine soot and ozone from burning fues. Additionaly, burning coal produces huge amount of ashes that are full of toxic heavy metals, in quanties that are near impossible to safely dispose of. Most of this ash just gets pilled up, where it it gets blown into the enviroment. (Fun fact, these ash piles are radioactive from naturaly occuring uranium and thorium)

    The only way out is to stop burning things as fuel.





  • Looking at other people’s schematics and messing around with making changes to them is a great way to pick up new tricks, but I recomend you also lean some of the basics. Experimentation is the best way to learn and internalize, so make sure do do plenty of that. I highly recomend you pick up a decent solderless breadboard, assortment of parts, an adjustable lab power suppy, multimeter, and osciloscope. For assembling projects in a more permenent way, I would recomend a perfboard, some thin insulated wire, solder and flux, and a good soldering iron.