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Joined 1 year ago
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Cake day: June 16th, 2023

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  • I lived for two years in Cameroon when I was a kid (around 4-5 years old), we were regularly spending time with another family who had kids and the same age.

    Fast forward 15 years later, I’m 19 entering university in a totally new city in France. The first day every student is sitting in the amphitheater and they call the name of every student.

    When they call the last name of the person close to me I recognize the name so I use it as an ice breaker to start a conversation saying that I knew a family with his name in Cameroon when I was a kid … He says that yeah he lived in Cameroon as a kid at the same time as I did, so here we go we found each other again 15 years later !


  • It seems like there is disagreement within NASA whether it is safe for the astronauts to return on Starliner or not.

    Boeing engineers did test on the ground to try to replicate the issue that is occuring on the thrusters. They found thqt the issue isndue to a Teflon seals bulging but they don’t understand precisely why is the seal buldging and when it occurs.

    However they feel confident enough that the problem would not happen on the way back to earth. Some people are NASA are not as confident as they are and would like to know the precise cause of the bulging.

    About the software: there is a capability in the software for the capsule to undock autonomously.

    However it would means resurrecting parameters that have not been used and updated since 2022, there is some reconfiguration needed and testing to make sure it still does what is needed despite the different hardware and software change that happened since then.

    It is really not looking good for Boeing right now and I don’t know if the Starliner program will survive this accident.

    https://arstechnica.com/space/2024/08/nasa-official-acknowledges-internal-disagreement-on-safety-of-starliner-return/2/



  • Applied to a real situation I’ve been through :

    • my pool 4.5m wide, 9m long and 1.5m deep, the current level of salt is 2.5g/l and a bag of salt weight 20kg. How many bags of salt do I need to bring the level to 3g/l ?
    • OR: my pool 14’9" wide, 29’6" long and 5’ deep, the current level of salt is 2500ppm and a bag of salt weights 40lbs. How many bags of salt do I need to bring the level to 3000ppm ?

    The answer to one is 1.5 bag, the answer to the other one is “fuck that, I’m getting 8 bags at the store and it should be good enough”