Although the human eye is sensitive to yellow and green, it has become a tradition to use red as a signal for caution. A ship carrying explosives would have a red flag flying to signal to other ships not to come very close. Experts believe that since the deep red colour of blood could shock people into alertness, such a shade was most suitable as a signal for caution. Red also has the longest wavelength and it was thus believed the colour would promptly draw attention even from a distance.
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एक स्कूल में टीचर ने अपने छात्रो को एक कहानी सुनाई और बोली एक समय …