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There are 126 species of birds that don't have the ability to fly, for various evolutionary reasons. Let's meet seven of them.

Mug warmers are great kitchen gadgets to have in the house. Learn more about mug warmers at HowStuffWorks.

Elephants never forget might be an overstatement, but these animals do have great memories. Is it possible that elephants never forget anything?

Fingernails have several parts and consist largely of keratin. Visit HowStuffWorks to learn all about fingernails.

Mayors get a lot of exposure and have tons of responsibility. Visit HowStuffWorks to learn all about mayors.

The stories of evil strangers tainting Halloween candy and apples with poison, glass and razor blades have prevailed for decades. Are they true?

Are patent trolls smothering innovation? Learn about the effects patent trolls can have on innovation at HowStuffWorks.

How does piston shape affect combustion? Learn about the effects that the shape of an engine's pistons can have on combustion.

Bacteria communication exists, just these tiny organisms have a different way of talking. Learn how bacteria communication works.

Think your mom may have obsessive behavior? Learn how to bring up the issue and begin the coping process.

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