So, on mornings like this one, Avie has to click a button on the floor that drops sand on the tracks as the car goes along.

NPR: Long Desired, Streetcar Returns to New Orleans

Smartphone-controlled products like LED lightbulbs and door locks are helping us control our homes with the click of a button.

CNN: 5 ways to beat the winter blues

If you find a tweet that's clearly mislabeled (like someone bragging that their new car is "sick"), click a button to let the app know they're not actually sick.

CNN: Tracking the flu with technology and Twitter

You can search for specific types of pictures or you can just click on the most popular pictures on the opening page and then just continue clicking on the "more shots like these" button.

BBC: Enviropedia website