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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Hooke_Microscope-03000276-FIG-4.jpg/64px-Hooke_Microscope-03000276-FIG-4.jpg" class="ribbon" />An early <a href="http://en.wikipedia.org/wiki/Microscope">microscope</a> was made in <span class="start">1590</span>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/9/94/Jan_Verkolje_-_Antonie_van_Leeuwenhoek.jpg/64px-Jan_Verkolje_-_Antonie_van_Leeuwenhoek.jpg" class="ribbon" />(<span class="start">1632</span>-<span class="end">1723</span>) <a href="http://en.wikipedia.org/wiki/Antonie_van_Leeuwenhoek">Antonie van Leeuwenhoek</a> teaches himself to make lenses, constructs simple microscopes and draws protozoa, such as Vorticella from rain water, and bacteria from his own mouth.</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/1/10/13_Portrait_of_Robert_Hooke.JPG/64px-13_Portrait_of_Robert_Hooke.JPG" class="ribbon" /><span class="start">1665</span>: <a href="http://en.wikipedia.org/wiki/Robert_Hooke">Robert Hooke</a> discovers cells in cork, then in living plant tissue using an early compound microscope</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Rudolf_Virchow_NLM3.jpg/220px-Rudolf_Virchow_NLM3.jpg" class="ribbon" /><span class="start">1855</span>: <a href="http://en.wikipedia.org/wiki/Rudolf_Virchow">Rudolf Virchow</a> states that cells always emerge from cell divisions (omnis cellula ex cellula).</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Louis_Pasteur_by_Pierre_Lamy_Petit.jpg/220px-Louis_Pasteur_by_Pierre_Lamy_Petit.jpg" class="ribbon" /> <span class="start">1859</span>: The belief that life forms can occur spontaneously (generatio spontanea) is contradicted by <a href="http://en.wikipedia.org/wiki/Louis_Pasteur">Louis Pasteur</a> (1822–1895).</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Friedrich_Miescher.jpg/150px-Friedrich_Miescher.jpg" class="ribbon" /><span class="start">1869</span>: DNA was first isolated by the Swiss physician <a href="http://en.wikipedia.org/wiki/Friedrich_Miescher">Friedrich Miescher</a>.</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Albrecht_Kossel_nobel.jpg/64px-Albrecht_Kossel_nobel.jpg" class="ribbon" />In <span class="start">1878</span>, <a href="http://en.wikipedia.org/wiki/Albrecht_Kossel">Albrecht Kossel</a> isolated the non-protein component of "nuclein", nucleic acid, and later isolated its five primary nucleobases</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/34/Levene.jpg/64px-Levene.jpg" class="ribbon" />In <span class="start">1919</span>, Phoebus Levene identified the base, sugar and phosphate nucleotide unit</div>
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<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/%D0%9A%D0%BE%D0%BB%D1%8C%D1%86%D0%BE%D0%B2%2C_%D0%9D%D0%B8%D0%BA%D0%BE%D0%BB%D0%B0%D0%B9_%D0%9A%D0%BE%D0%BD%D1%81%D1%82%D0%B0%D0%BD%D1%82%D0%B8%D0%BD%D0%BE%D0%B2%D0%B8%D1%87.jpg/64px-%D0%9A%D0%BE%D0%BB%D1%8C%D1%86%D0%BE%D0%B2%2C_%D0%9D%D0%B8%D0%BA%D0%BE%D0%BB%D0%B0%D0%B9_%D0%9A%D0%BE%D0%BD%D1%81%D1%82%D0%B0%D0%BD%D1%82%D0%B8%D0%BD%D0%BE%D0%B2%D0%B8%D1%87.jpg" class="ribbon" />In <span class="start">1927</span> <a href="http://en.wikipedia.org/wiki/Nikolai_Koltsov">Koltsov</a> proposed that inherited traits would be inherited via a "giant hereditary molecule" which would be made up of "two mirror strands that would replicate in a semi-conservative fashion using each strand as a template".</div>
<div class="event"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Matthias_Jacob_Schleiden.jpg/64px-Matthias_Jacob_Schleiden.jpg" class="ribbon"/>In <span class="start">1838</span>, <a href="http://en.wikipedia.org/wiki/Matthias_Schleiden">Matthias Schleiden</a> proposed that the <b>nucleus</b> plays a role in generating cells, thus he introduced the name <b>"Cytoblast"</b>.</div>
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