Storing an email address enables people to contact you through the website without you having to reveal your email address to them, and it can be used to send you a new password if you forget it.Your real name, if you choose to provide it, will be used for giving you attribution for your work.
For example, a rather dubious adult website managed to get a pagerank of 10.
He pointed on the page to reveal a link to a website with a single name and phone number written on it.
The military doesn't buy their haircuts, website design, or piano lessons.
This website and project are not related to the current Encyclopedia Britannica, Inc. other than it being based on its 1911 Edition.
A website called Wolfram Alpha is amazing to me, especially in its aspirations.