Valve's co-founder and president Gabe Newell is set to host a Reddit AMA today at 11pm GMT (that's midnight CET). The purpose of an AMA is, of course, to answer any and all questions and we'd imagine fans will want to know about Half-Life 3. Particularly about the unverified rumours that it never existed that surfaced via GameInformer not long ago. Did it ever exist? Does it exist? Hopefully, Newell will be able to provide some clarity, even if there's no reason to expect to hear the whole truth. Afterall, Valve likes to keep secrets...