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The popping of a balloon happens too fast for us to see in detail. But high-speed photography reveals what is happening at the time of the pop: The stretched skin of the balloon breaks rapidly and violently.
Butterfly on a plant stem
The cellular structure of this sunflower stem includes red vascular areas and blue supportive tissue. This systematic regularity contrasts with the sweeping outline of the butterfly.
Cancer cell movement
This cancer cell is moving down a pore in a filter, during a process of spreading called metastasis. The image was taken at Cancer Research UK, where the spread of cancer is studied in the hope of finding a cure.