"Hidden" features in Google products

I recently had to explain to a senior citizen, an Internet newbie, on the phone how to upload files onto Google Docs/Drive.

It then stuck me as odd that the Upload button next to the Create button doesn't have a label on it but rather a stupid icon. I was suprised about how a company that supposedly spends a lot of time on usability testing and picking the right shades of color could not have kept things simple and intuitive by giving a button a label like it's normally done.

Let's say you accidentally closed the Tasks window in Gmail. How do you get it back?

Its under the dropdown-kind-of-thing that you get when you click on the little arrow next to the Gmail "label"

to be continued...