# data[].attributes.body
it may be Hz, kHz, MHz, GHz

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it may be measured in km, m, cm, mm, cm

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our eyes can detect only a tiny part of the electromagnetic spectrum called visible light. 

# data[].attributes.subject
our eyes can detect only a tiny part of the electromagnetic spectrum called visible light. 

# data[].attributes.body
this means that there´s a great deal happening around us that we´

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if you look at light to long it could hurt your eyes. another danger could be the visible light could burn your skin and give you a sun burn

# data[].attributes.body
visible light is use full. It helps us see in the dark.
we know to use visible light when we cant see