It’s hard to compare to exoplanets as we barely even know their sizes let alone densities. But in our solar system earth is the densest of 5.5g/cm3. Close are only Mercury 5.4 and Venus 5.2. Then you have Mars 3.9, Io 3.5, Moon 3.3, Europa 3.0, Triton 2.0, Ganymede 1.9, Pluto 1.9, Callysto 1.8…
Is not a big sample size, but I’d still assume that such dense planets (high gravity for their size) as Earth are not very common.
An electric keyboard imported from outside of soviet block. I was too young and stupid to understand the power brick and conected it directly to mains. A shower of sparks tought me an important lesson about electricity and voltage.