Delete photos from phone (but keep them in Google Photos)

With Google's Back up & sync, if you delete a photo from your phone in Google Photos, the photo will be deleted from any where. In case this is what you intend to do, here're the steps

1. Open Google Photos
2. Click the hamburger button at the top left corner, or swipe right from left edge of screen
3. Select "Device folders"

You know how to do the next.

Merit Certificate in Science Talent Search 2015

The boy got a merit certificate this year. This is also the end of his fantastics 7-year STS journey. The next chapter is waiting for him to explore, so it's right time to move on.

It's my privilege to be able to work with him all the way. The little boy curious about how computer programs work has become a pretty mature problem solver. I'll never forget the very first time he went out from the judging room, told me he was asked a question 'what's a variable?'.

If you have a Pebble smartwatch, you may want to try his application here.