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Measure reaction time over 5 rounds with best and average stats
Validate Chinese ID card and query province, birthday, age, gender, zodiac
Look up retirement age under gradual delayed retirement policy by birth date
Local todo manager with completion tracking, filters, and localStorage
Random cuisine picker to solve food indecision, supports re-pick
Random witty poison chicken soup quotes, copy and share
Tap for merit +1 with sound effect and floating animation, saved locally
旋转"是 / 否"转盘，快速做出随机二选一决定，選択困难症救星
Predict possible and impossible child blood types from parents (with Rh)