I mean, the conversation started about America’s electric grid. It was ambiguous from context.

I’ve never heard of anywhere in US using 50Hz and I’ve lived on the West Coast my whole life.

As if there was no civil unrest in the 60s, and there was no one surfing at the beach today.

The lab quality bit is optional.

Ensign is an officer rank.

The rich can afford to make their tennis courts out of uranium while the poor have to play on hydrogen.