How is fermium used?

No, fermium is too unstable to have any practical uses.

No practical uses, only for research

The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...

A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)

Porcini, baby portabello, and regular white mushrooms are common pizza toppings.