4. Mental Floss
Remember how I said Vlogbrothers have taken it all? I wasn’t kidding. This time however, we turn our attention to what I would call John’s baby. Now, Mental Floss magazine has been around for ages, and John Green is still an active contributor for the science magazine. Of course, when they decided to create a YouTube channel, they reached out to the person who knew a lot about that, and the channel has expanded with hosts like Elliott Morgan, Craig Benzine, and Michael Stevens from the aforementioned VSauce.