When did Leonardo da Vinci start keeping diary detailing his ideas and inventions?

Options :
  1. 1490
  2. 1500
  3. 1505
  4. 1520
Answer and Explanation :-

Answer: Option 1

Explanation:

It was his diary entry dating 1490 in which he described capillarity , the way in which liquids rise up through small bore tubes.

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For like a shaft, clear and cold, the thought pierced him that in the end the Shadow was only a small and passing thing: there was light and high beauty for ever beyond its reach.
-J.R.R. Tolkien The Return of the King