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Joined 2 years ago
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Cake day: September 14th, 2023

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  • What does it mean when light hits something? Is light “hitting” the air around you? If so how can you see at all?

    For light to measurably change when it interacts with a particle or group of particles, there has to be a separation of electrical charges. The light also has to be close to the energy of an available energy state transition. There’s lots of diffferent types, but remember electron orbitals? Most visible light interactions involve electrons jumping to higher energy orbitals or falling to lower energy orbitals. There are only very specific interactions that are possible with specific wavelengths of light. Fortunately, visible light spans a wide range of wavelengths that interact very strongly with the forms of matter that surround us.

    There are lots of things that won’t interact with light at all. Nuetrons and neutrinos don’t have a charge separation and don’t interact with light at all. You could shine very strong lasers through a cloud of neutrinos, and as far as the beam path would indicate, it would be identical to vacuum. They have to be studied by how they interact with other matter that does interact with light. It may sound counterintuitive, but single free charges like a bare hydrogen nucleus or free electron also don’t absorb or emit photons. It is only when charges can interact with eachother that we get light interactions.

    So nothing measurable happens when light propagates through a volume where dark matter is. There is no mechanism by which the two can interact, except gravitational lensing.


  • The supply side of power generation is coordinated by a bid system. So the cheapest sources are activated first. As demand goes up increasingly expensive forms of power generation are turned on.

    For daily and seasonal variation, this is fine. The amount of time that really expensive generation is active is only a small portion and the base rate can stay low. However, if you add a bunch of baseload without adding equivalent generation, your utility will be stuck buying at the top end of the capacity market auction. The datacenter will have negotiated a discounted rate though because constant demand is good for the utility in the long run. That leaves everyone else paying a big rate increase.

    Source: none given, but the capacity auction is a real thing, and the predicted behaviour of such a system can be reasoned.










  • Hunter’s ed is basically the opposite of what you stated. It’s not part of the state curriculum. It’s similar to drivers ed courses for people to be able to get a learners permit before they turn 18. Similarly below a certain ages, most states require completion of a hunter’s education course to be able to purchase a hunting license and legally hunt.

    The courses go over topics like property rights, how to carry a weapon making sure it’s not pointing at anyone, what high vis clothing is required, always knowing what is behind an animal before even aiming, rules about how a weapon must be unloaded when in a vehicle, and they strongly urge keeping an interference lock in the action of any firearm in storage.

    Hunter’s ed doesn’t teach kids how to shoot, they teach kids how to not be idiots when hunting.