The idea of possible connection between mass and energy was noticed by few scientists before Einstein time. The work of Friedrich Hasenöhrl came very close to the E=mc^2 of Einstein.

Main post link -> http://www.sciencedaily.com/releases/2013/01/130125103931.htm?utmsource=feedburner&utmmedium=feed&utmcampaign=Feed%3A+sciencedaily%2Ftopnews+%28ScienceDaily%3A+Top+News%29

The Austrian physicist arrived at an energy/mass correlation with the wrong factor, namely at the equation: E = (3/8) mc^2.

So if you like to read some more the link is added up.

Easy Math Editor

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$