The search for life beyond Earth is one of the most profound quests in human history. It began not in laboratories, but in ...

Visual: In this diagram, J, S, U, and N are the solar system’s giant planets. What’s the collective name for the objects in ...

During glycolysis, cells make energy by breaking down glucose step by step. One compound gives its phosphate group directly to ADP to form ATP in this process, which is the cell’s energy source. Which ...

Some questions in life have endless possible answers, but not in this quiz. Here, it’s all about picking one or the other: ...

Think of this as the US student assessment meets “let’s see if my brain still works.” It’s your chance to find out if you’d ...

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