I work at a place where we develop microscopes (fairly powerful, laser-based microscopes). It's complicated to get the autorizations to bring biological tissues

I work at a place where we develop microscopes (fairly powerful, laser-based microscopes). It's complicated to get the autorizations to bring biological tissues (that's our official, grant-application name for supermarket meat) into the uni lab, so most researchers just trust the calculations and image their own fingers. My research director always uses the same finger, although it's a bit of a superstition...