Matter & Energy

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gram staining bacteria

COLOR CODED  An old lab technique for differentiating bacteria as either gram-positive (left) or gram-negative (right) has been incorrectly explained for decades.

supermassive black hole

SUPERMASSIVE IDEA  Black holes, such as the supermassive one illustrated here, have transformed astronomers’ understanding of the cosmos in recent decades.

thunder image

BOOM CLAP  Scientists captured the first acoustic image of thunder (right) emanating from an artificially triggered lightning strike (left). Warmer colors indicate louder measured sound waves.

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