YSK: If you are having a tough time operating the fancy drink fountains with touch screen menus, use two fingers together instead of one

Sometimes the touch of a single finger is not enough to register.

It's not the force of how you hard you touch, but it's the surface area contacting the screen.

I see a lot of children and some men and women struggle on this because their single finger isn't large enough. They usually get around it by pushing firmly, which worked because they got more of their finger in contact with the screen, but they risked damaging the screen a bit by pushing so hard.