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May I recommend consideration of a microscope.
It has the advantage of one initial investment with minimal ongoing expenses which are basically limited to a set of glass slides and cover slips.
You can use it anytime and if you buy a camera in your original purchase package you can enjoy a different world of photography.
I watch little creatures who live in pond water, which is very interesting because even as small as they are you can observe various behaviours.
There are however many things to observe apart from life in pond water.
Anyways to be a well rounded person one really should have many hobbies in order to keep a general broad interest as opposed to focusing totally on one thing.
Alex
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