I need some help with a doubt that i have

[From: ] [author: ] [Date: 12-02-29] [Hit: ]

and in the other he explains the phenomenon of Brownian motion. The net result is a proof that atoms actually exist—still an issue at that time—and the end to a millennia-old debate on the fundamental nature of the chemical elements.http://www.pbs.......

ok here is my question

most of us have never directly seen an atom, but we believe that they exist. so, what is the evidence for (or against) the atomic theory?

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April and May, 1905: Albert Einstein publishes two papers. In one he invents a new method of counting and determining the size of the atoms or molecules in a given space, and in the other he explains the phenomenon of Brownian motion. The net result is a proof that atoms actually exist—still an issue at that time—and the end to a millennia-old debate on the fundamental nature of the chemical elements.

http://www.pbs.org/wgbh/nova/einstein/ge…

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