re: Anyone on here not know how to swim?

That doesn't make sense. Are you panicking and being spastic? Do some people just have a different body composition to where they aren't as buoyant?

None of my grand parents knew how to swim. My mom didn't learn how until she took me to swim lessons and the instructor explained the importance of it.

I think the reason people drown is because the fear of their face/mouth/nose going underwater causes them to panic, flail about, wear out, and swallow water.

The key to floating is to submerge as much of yourself so that the water displaces your mass. If you let that happen, there's a good chance your chin and maybe even mouth are going to be below the surface. If you're cool with that and lightly kick your feet and wave your arms, you can tread water for a LONG time.

In college I took swimming as an elective and to get an A we had to tread water for 45 minutes with our hands on our heads. If you let your body sink down in to the water with just your eyes and nose above, you don't have to fight so stay there hardly at all.

Being comfortable in the water is the key.

As with most things in life, it will all work out if you don't panic.