I had to do a double take on your "about 1 kg Mg in 1000L of seawater" stat, thinking it was for titanium, rather than magnesium. For those curious, titanium i

I had to do a double take on your "about 1 kg Mg in 1000L of seawater" stat, thinking it was for titanium, rather than magnesium. For those curious, titanium is present in sea water, at 1 ppb! (magnesium is 1300 ppm)