Journalists don’t know anything. That’s their job. If they knew anything they’d be doing something that paid better. Besides, knowledgable journos wouldn’t be better journos, they’d just be more opinionated and that would reduce their value as reporters. An exception to this rule seems to be Mars guru Oliver Morton. I don’t want to gush (for the second time in a week) but any reporter who can whip out his Texas Instruments Scientific Calculator and work out that the output of methane predicted by the latest spectrographic analysis of Mars is equivalent to 2,000 terrestrial cows is knowledgeable enough for me.