The son install the app "Pass" on his father's iPhone, and told him should follow the trend. One night the father went out, the son refreshed the location of father, it was 10km far, and he began to watch the love action movie at home relieved. After a while, he refreshed again and found his father was only 0.9km far. He turned the player off calmly, then opened the "advanced mathematics" ......Pass, let me know where are you!
Pass---Connect to real world! http://www.passfeed.com