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I always had an easier time with adults. Somehow, I was always old! I still feel old.

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Antonie van Leeuwenhoek

In the year 1657 I discovered very small living creatures in rain water.

1657, Creatures, Discovered, Rain, Water, Years
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Man has always to be busy with his thoughts if anything is to be accomplished.

Accomplished, Busy, Man, Men, Thoughts

Whenever I found something remarkable, I have thought it my duty to put down my discovery on paper, so that all ingenious people be informed thereof.

Discovery, Duty, Found, Paper, People

I observed certain animalcules, within whole bodies I saw so quick a motion as to exceed belief; they were about the size of a large grain of sand, and their bodies being transparent, that the internal motion could plainly be seen. Among other things, I saw in the body of one of these animalcules a bright and round corpuscle, placed near the head, and in which a very wonderful swift motion was to be seen, consisting of an alternate extension and contraction. This particle I concluded to be the heart.

Bodies, Heart, Particle, Sand, Saws, Size

I've spent more time than many will believe [making microscopic observations], but I've done them with joy, and I've taken no notice those who have said why take so much trouble and what good is it?

Believe, Good, Joy, Taken, Time

[M]y work, which I've done for a long time, was not pursued in order to gain the praise I now enjoy, but chiefly from a craving after knowledge, which I notice resides in me more than in most other men. And therewithal, whenever I found out anything remarkable, I have thought it my duty to put down my discovery on paper, so that all ingenious people might be informed thereof.

Hard Work, Ingenious, Knowledge, Men, Notice, Wisdom
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