>Take any solid element that doesn’t vaporize, and heat it to, say, 700 degrees and you will find it emits exactly the same spectrum of light as any other solid

>Take any solid element that doesn’t vaporize, and heat it to, say, 700 degrees and you will find it emits exactly the same spectrum of light as any other solid element also at 700 degrees. The reason this happens is because we live in a quantum world. i think the author is deeply mistaken here. The idealized "black body radiation" of classical physics would be the same for both elements. It is because of quantum mechanics that the actual spectrum of different elements at the same temperature is different.