How do companies remove the lactose in milk to make it lactose-free milk?!

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Its true that most animals no longer drink milk after a certain age. However, some early human groups (especially northern Europeans) evolved to retain the ability to drink milk in order to gain access to another food source.

Chemically, lactose consists of a galactose molecule and a glucose molecule. Anybody can break down either of these molecules, lactose intolerance comes from an inability to break the galactose-glucose linkage. Lactose-free cow's milk has had the lactose molecule pre-broken into galactose and glucose by passing it over a substrate embedded with the lactase enzyme. The enzyme snips the lactose bonds, but remains stuck to the substrate so it doesn't end up in the milk.

If you're lactose intolerant, nothing would make me think you should drink milk. And I don't know how they remove the lactose.