Many YouTube channels are dedicated exclusively to science, and together they have many millions of followers. YouTubers handle complex stories, from black holes to the 'antivax' controversy. Many have not been to journalism school - and don't call themselves science journalists - but they share codes and skills with more traditional science journalism.

Where is the border between science communication on YouTube and science journalism? Do YouTubers need science reporters? Should science journalists collaborate more with YouTubers, in their common interest, and what can they learn from each other?