[antognini]

Oh for sure there is a ton that is going on behind the scenes when you substitute `np` --> `jnp`. But as someone who worked on gravitational dynamics a decade ago, it's really incredible that so much work has been done to make running numerical calculations on a GPU so straightforward for the programmer.

Obviously if you want maximum performance you'll probably still have to roll up your sleeves and write CUDA yourself, but there are a lot of situations where you can still get most of the benefit of using a GPU and never have to worry yourself over how to write CUDA.