Now, people on the radio, especially on NPR, are much more aware that they're going on the record, and so they're more careful about what they claim to be an expert in and what they claim to know for sure.
As pessoas na rádio, particularmente no NPR, têm mais consciência de que estão a ser gravadas, portanto são mais cuidadosas a afirmar serem especialistas e a afirmar que têm a certeza.