I learned to swim a few weeks before my 13th birthday. Very little improvement in the past 60 years, but I keep trying.

I don't use metric units all the time, but it's not a problem. I can think and measure in either system. Many people in the US can do that. The medical profession, and almost all sciences use metric measures. It's handy for those of us with scooter collections. My Cushmans are SAE and my Vespas, my Hondas, and the Benelli are all metric. I have two sets of tools. Is there such a thing as a metric screw driver?
Howard

> > That question about how far can you swim is like how fast can you run. My running speed varies, depending on the situation. If I am called to supper, I'm fairly fast, but if a bear is chasing me, I'm much faster. When I run in the rain, I don't go very fast. I know I'm going to get wet anyway and I'll dry out.
> >
> > Normally, I don't swim very fast or very far. I guess my distance depends on how far I am from the dock. But if I need to swim very far I can always swim a while, then float and rest, and swim some more. It takes forever, but so far I have always made it.
> > Howard
>
> I had to convert the US units to metric units in my head. If you ask me if I can swim ten feet, my first thought is "no idea". When I have made a quick calculation that it's about 3.3 metres, then I can answer that yes, that's about as far as I can swim. And I only learned to swim at about age 13 or 14.