Open them all in Photoshop from File->Scripts->Statistics. Choose "median".
在Photoshop中从“文件-脚本-统计”中打开所有照片，选“中间值”。
Layman's Logic: Only constant pixels in all 15 images are those, that don't belong to the moving objects(tourists) and get cancelled out while taking median.
外行人的逻辑：取“中间值”时只有15张照片像素相同那些不属于移动物体（游客）的才能被覆盖。
People agree that it works both in theory and practice.
人们认为这在理论上和实际上都行得通。
Obviously more number of images will improve the quality of output.
很明显照片越多最后出来的效果越好。
获得7k好评的回答@Nikhil Saurabh：
1.If you are Travelling in Indian Railway and that too in sleeper class then never keep your shoes on the fan… never do this because according to fans mechanism it will pull all your shoe dirt and add it air which eventually you will breathe.
2.When booking flights and hotels online enable private browsing. Travel sites often track your visits and will raise the price simply because you’ve visited before.
2.网上订机票和酒店要使用个人浏览器。旅行网站常会追踪你的浏览记录，就因为你之前浏览过就会提价。
3.Glass cases are perfect for chargers and cables.
3.眼睛盒最适合装充电器和电线。
4. Put underwear and socks in shoes to save space.
4.把内衣和袜子放在鞋里能节省空间。
5. A binder clip will protect the head of shaving razors.
5.燕尾夹能保护剃须刀头。
6. Use a pen spring to protect chargers from bending and breaking
6.用圆柱弹簧保护充电器不弯不折。
7. Never forget to carry a Powerbank
7.绝对不要忘带移动电源。
8. This one isn’t exactly a hack – but will leave you feeling good. On your last day in a foreign country collect all your loose money and give it to the homeless.
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