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Cake day: July 4th, 2023

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  • If you are worried, a qualified medical practitioner is always more reliable than a web forum.

    Insufficient or poor quality sleep can cause problems with attention and memory, and can exacerbate existing conditions.

    Poor sleep could be caused by a medical condition (sleep apnoea), or psychological (stress). Often stress can be hard to identify, particularly if it’s long term stress.

    Again, this might not be your problem, and finding the right doctor who actually listens to you is important. Don’t be afraid to try more than 1 doctor if the first makes you uncomfortable.






  • It depends on your country, your budget, your definition of good, and your driving needs.

    A second hand Nissan Leaf or Chevy Bolt are more affordable, but don’t suit everyone’s needs.
    An MG4 is a great budget new car, but can be out of some people’s price range.
    A Polestar 2 is a comfortable option from a manufacturer who cares about the environment.
    A Porsche Taycan is a performance car for a fraction of the price of a petrol supercar.














  • 18107@aussie.zonetoMemes@lemmy.mlSir I am broke
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    11 months ago

    I have a 2011 Nissan Leaf AZE0 24kWh with about 40% battery degradation. It can drive about 80km (50mi), which is perfectly adequate for a second car. It is rarely driven more than 20km in a day.

    My other car is a 2018 Nissan Leaf ZE1 E+ G 62kWh with about 4% battery degradation.

    The fastest battery degradation happens when the battery is new, and the degradation slows down gradually over time. I expect the 2011 Leaf to still have at least 50km range in 2041, and the 2018 Leaf to still have at least 200km (130mi) range in 2038. Both of these will still suit my needs.


  • 18107@aussie.zonetoMemes@lemmy.mlSir I am broke
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    11 months ago

    Most large combustion SUVs are heavier than most electric cars.

    Sodium ion batteries are being produced with no rare metals in them, and will be in production cars within a year. Hydrogen is difficult to store due to is low volumetric density, it’s molecular size, and corrosive nature.

    Hydrogen (fuel cell) cars all have a battery because a hydrogen fuel cell is slow to change it’s energy output, so can’t change its output fast enough to directly power the car.

    Battery electric cars are about 90% efficient from charging from the grid to moving. Hydrogen cars are about 30% efficient from grid to moving when made from renewable energy. These efficiency numbers include the weight and rolling resistance of the car. The theoretical maximum efficiency of hydrogen storage allowed by the limits of physics is about 50%.

    The volumetric density of hydrogen is so low that you would need 20 tanker trucks to transport the same amount of energy that 1 tanker truck of gasoline can carry. This is at maximum pressure or liquified.

    Hydrogen only makes sense when the weight of the energy storage medium is critical. As demonstrated by American cars, it isn’t.