At nearly twice Earth's size with a denser atmosphere, this fictional world hosts creatures that dwarf anything alive today, including a structure-sized organism called the Blitz Spire.

For instance, what if we really are being visited by aliens from other worlds and they turn out to be aggressive, violent, ...

Each question in the ABC 50/50 quiz has only two options: one is right; the other is wrong. But there's a catch.

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A school year’s worth of short, accessible image-driven posts that invite a variety of kinds of writing By The Learning Network To participate, submit your response here by July 17 at 9 a.m. Eastern.