I am a fundamental building block of matter, yet I am invisible unless combined. What am I?
Category: Science · Difficulty: medium
Hint: Think about what makes up everything around us.
Answer
An atom
Explanation
An atom is the smallest unit of matter that retains the properties of an element, and it is generally not visible on its own.
This is a medium science riddle — a moderate challenge for most people. The answer is An atom.
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