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"This is a testament to your test reply of someone's test" , he replied testily.

I have only ever posted .jpg and my recent success was also.jpg. There is not difference between .jpeg and .jpg. This is what Google has to say: "There is no practical difference between JPEG and JPG files; they both refer to the same image file format created by the Joint Photographic Experts Group. The shorter, three-letter "JPG" extension originated from a legacy limitation in older versions of Microsoft Windows, which only allowed three-character file extensions. Modern operating systems no longer have this limitation, so most applications can open and interpret both file extensions interchangeably, making them identical in function. "

https://new.coinsweekly.com/people-and-markets/the-worlds-smallest-coin/#:~:text=The 1-kuna Hum coin,as the world's smallest coin.&text=The representative of Guinness World,Photo%3A Croatian Mint. The smallest "coin" is just 1.9mm. But I am not sure modern gimmicks count.