No need to dismiss contrary points of view. It's clear excessive exposure to sunshine is unhealthy. It's not clear that sunscreen is safe to use. If you have to choose between the two, then yes, choose sunscreen. But there are alternatives, like wearing long sleeve shirts and long pants, and wide brimmed hats (be aware of reflective surfaces, like snow or water, that probably bounce UV rays under hats). Personally, I dislike the feeling and smell of sunscreen. I'd rather find another way to cover up or just limit outdoor exposure during high UV periods (use your parent's basement if you need to :)

I use handheld computers on a regular basis at work. When I switch back to using a laptop after spending some time using a touchscreen device, I naturally want to touch the screen to move windows, select items from the taskbar, etc. It's silly that the functionality is missing. There's no need for this to replace the mouse. Touch-display and mouse input should complement each other.