A technical show like this talks about speeds and weights constantly. And every minute or two they will mention a speed or weight, then feel like they need to convert from mph to kph or lb to kg. Once you notice it, it's hard to unhear and it happens at least every minute or two. Every single short little segment they highlight is a "wonder" or something "crazy" with speed or weight or computers, so you get the idea. Constantly telling us conversions.
"This plane is traveling at 100 mph, or 160 kph." "This glider weighs 100 pounds, or 220 kilograms." Constantly.
It's an American show, so keep it simple, I can convert in my head, I'm sure others watching can as well.. Can't watch it now.