Of course, a laser pointer can damage the retina, but not during normal, intended use. I was responding to someone who had said that using a vacuum cleaner in a normal way caused greater pressure waves to a fetus than an ultrasound could. I’m saying that in using a vacuum cleaner as it was meant to be used, there’s not a problem, but when using ultrasound as it was meant to be used, multiple studies have shown this unusual link with an increase in left-handedness.
What, may I ask, is your “science background?”
I have a back ground in thermodunamics and lasers and electrooptics. I currently am in a job where I do pure research and development. In the past I have been in r&d for profit (and frustration).