Princess Elettra Marconi Giovannelli visited the historic park named after her father last week, part of a Bay Area tour with scientists working to harness power from light waves.   Teresa Mathew

A princess came to town last Wednesday. She was dressed in sensible black heels, thick pantyhose and a silken neck scarf. Eighty-eight-year-old Elettra Marconi Giovanelli, her hair a soft nest of fading blonde curls, was visiting West Marin to bear witness to her father’s electric legacy. 

The princess is not the daughter . . .