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To enforce a break so picture stays with block
<br clear="all">
To embed an acrobat pdf file for slide series
<embed_document width="55%" height="400">http://depts.washington.edu/cmditr/media/OLED2_ecl_redoxpairs.pdf</embed_document>
To make a heading that autmatically gets assembled as table of contents when there are more than 3 such headings.
===Heading===
TO have a gallery of images with individual captions
<gallery widths=300px heights=200px perrow=3> Image:Oled1_3_eclredox.png|First the loss of an electron by this conjugated aromatic system to form a cation radical species. Image:Oled1_4_eclredox.png| </gallery>
To put mid size picture in the scene
[[Image:OLED5-organic_heterojunction.jpg |thumb||400px | Organic Heterojunction]]