When I was a kid, I always loved to play with my grand grand father’s microscope which used to be used for checking meat for presence of dangerous worms. I was unhappy that I could never get back to things I saw. I couldn’t take pictures or videos.
So when I saw this 15$ USB microscope on Ebay I had to buy it. I installed it on the old microscope set up and had lots of fun with.
With this microscope you can see objects up to 30um of size. I was able to observe yeast cells. Also I observed real living microorganisms in pond water enriched with moss from trees.
While it is not a practical thing for me right now, I really like buying it.