I was half joking but no question if you grew up in the 60s,70, 80s before these thing were known and you played outside you probably have some sort of brain trauma... We had those iron steam radiators that myself and brothers rough housing ended up in the ER with staples in our heads... not to mention soccer, football and other street sports we played in the city... Not sure I even want to know... but as I get older... I am aware as my brain atrophies the scar tissue from those events and a few others cause momentary memory loss... Not sure.