| What you said about where you shook your head: a hands-free implementation of a location-based notification system Recent countries visiting this post |  |
 | 3 | United States |
 | 1 | China |
| What you said about where you shook your head: a hands-free implementation of a location-based notification system Recent countries visiting this post | |
| 3 | United States |
| 1 | China |