I assume they are targeted ads for physicists? I remember “fondly” the times when a website about kiteboarding would serve kiteboarding ads. Those were actually very useful. Now they are showing more blenders after I just bought one.
I used to read a lot of geeky blogs when I was younger and they would advertise stuff that I thought was cool - gadgets and doodads mostly.
I went back to a couple of those sites this year and the ads are now mostly for single women in my area -_-