Green-eyed Dragon (6) Idea (5) Martin Gardner (3) Scientific American (1) collection (6) laolao (1) review (2) travel (2)

 Green-eyed Dragon (6)

Tower of circles
Angles
Letters in Envelopes
Waiting for An Ace
The Hotel Problem
Flipping a Coin

 Idea (5)

One week blog
One week blog
Shopping Tips
杂记
The Life of My Aspirations

 Martin Gardner (3)

Coin Puzzles
拼接
失踪的正方形

 Scientific American (1)

The Three Types of Twilight

 collection (6)

Ask and Answer
FS blog
Achieve a small goal
ffmpeg codes
HOMO LUMO GAP
作战记忆--作战之后不想忘记

 laolao (1)

晨兴，真正的挑战

 review (2)

Book Report of [On Writing Well] Part 1
Review of [in the margins of life]

 travel (2)

Tonglu Town
guadalupe mountain