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And this is the A3KX, this is the SRU Science and Tech Net, coming to you from Toronto and Canada. If you'd like to join us, you have a comment, come on in. And then another one here, this is a study of the University of California, San Diego. And this is about how they're thinking that lead exposure may have helped shape human intelligence. Lead, aluminum, all these metals are in our environment, they always have been. Ever since we climbed down other trees and were dragging our knuckles along the ground, water we drank, had aluminum in it, had lead in it, but it was a load of concentration. That's what has caused a huge, huge amount of problems for us. But a new study is saying that the environmental lead that we were exposed to earlier on in our evolution contributed to our intelligence. This is the A3KX, if you'd like to join us, you have a comment, come on in. And I'll go into this one.