We bring you discussion, debate and issues from around the web and around the world by focusing on the most popular educational hashtags on Twitter

TES columnist Tom Bennett last week wrote a blog on why teachers need better subject knowledge (bit.lySubjectKnow). Preaching to the choir, you might think. Not necessarily.

On Twitter, a couple of people used sports analogies to describe why they believed it wasn't particularly necessary for teachers to know more than their students. @derek_conway1 said: "Just to be awkward, Mark Spitz's coach couldn't swim."

@mikercameron, although professing an instinctive fondness for the idea, added: "On the other hand, none of Tiger Woods' coaches ever won a pro event." And @Ezzy_Moon pointed out that it was a lot easier for people to get more subject knowledge at secondary level, where they taught in only one area: "Testing is the end goal, not basic knowledge. At primary, teachers can't be experts in all subjects."

However, others pointed out that better subject knowledge could lead to better teaching. @MrTBakerGHS said: "Part of the fun of going over subject knowledge is that I always learn something extra or a different way of approaching it."

And whereas @NuttySalt said, "Knowledge can be improved but can you teach passion?", @TheRivetDaddy countered: "The best teachers I had OOZED passion for their subject. Tough to do if you don't know it." Sarah Cunnane

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