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Đinh Hương Thịnh

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What is the missing number?
Remove 6 letters from this sequence (ORIGURUSGMINALLY) to reveal a familiar English word.
A 3-letter word has been taken out of each of the following words. The letters may not be adjacent, but they are in order. Can you find that word?

Camera obscura

In 1544, a solar eclipse was viewed at Louvain, which was later depicted in the first published book illustration of the camera obscura in use. Dutch mathematician and astronomer Reinerus Gemma-Frisius viewed a solar eclipse using a hole in one wall of a pavillion to project the sun's image upside down onto the opposite wall. He published the first illustrationof a camera obscura, depicting his method of observation of the eclipse in De Radio Astronomica et Geometrica (1545). Several astronomers made use of such a device in the early part of the 16th century. Both Johannes Kepler and Christopher Scheiner used a camera obscura to study the activity of sunspots. The technique was known to Aristotle (Problems, ca 330 BC).

Q: What is the lightest thing...

Q: What is the lightest thing in the world?
A: A penis because just a thought can lift it.
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