What can be measured but not seen?

What can be measured but not seen?

Other Difficult Riddles

Where do you go in through one hole and come out through two holes at the same time?

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I can be moved. I can be rolled. But nothing will I hold. I'm red and I'm blue, and I can be other colors too. Having no head, though similar in shape. I have no eyes - yet move all over the place.

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Feed me and I live, give me drink and I die.

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Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.

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Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.

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Riddle of the Day

Jan 30, 2026

What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?

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