Four people in England back in 1953, stared at Photo 51, It wasn't much-a picture showing a black X.

在1953年的英国，有四个人在凝视着图51。这幅图看起来没什么，只有一个黑色的X。

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This photo taken at 0:51 p.m. on Aug. 24 shows what is believed to be an unidentified flying object in the sky above Seoul’s Cheonggyecheon Street.

这张照片拍摄于8月24日的中午12点51分。 它清楚的拍摄了一个在首尔清溪川大街上空的不明非飞行物。

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Photo 51 is not the sort of image you would take with a normal camera.

BBC: The most important photo ever taken?

Known as Photo 51, it's an X-ray diffraction image of DNA and has at least a claim to be the most important image ever taken.

BBC: The most important photo ever taken?

The image of Photo 51 is tiny - just a few centimetres across - and holding the glass plate in my hands felt like handling a piece of history.

BBC: The most important photo ever taken?