Why do you need to type two extra words into the form in order to send it?

"Robots" search the web tirelessly all day long to gather up email addresses to send spam to (and from). They also can fill out forms to send their spam to you. This stops such activities.

Courtesy of Carnegie-Mellon University, when you fill out the words you are also helping digitize books. For more information on how it is done, check here.

If you have trouble reading the words, click the little icon that has arrows chasing each other for another set. There is also an audio version obtained by clicking on the little speaker icon.