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How would I go about calculating the volume of a region of space contained between 4 spheres of radius r, all contained in a cube with sides of length 4r?

The spheres touch each other and the walls of the cube tangentially.

Now I can easily calculate the total volume of empty space in the cube by subtracting the volume of the four spheres from the volume of the cube, but how do I go about calculating the volume of just the bit enclosed by the 4 spheres i.e. at the center of the cube?

For the last week I have been having off and on trouble with Windows Live Mail and my yahoo password, I know the password is correct. I have checked it 10 times and changed it and the problem is intermittent. I get this error:

Unable to send or receive messages for the Yahoo (xxxxxxxx) account. An incorrect password was entered. The next time you send or receive messages, you'll be asked to enter your user name and password for this account.

Server Error: 0x800CCC90

Server Response: -ERR [AUTH] invalid user/password

Server: 'pop.mail.yahoo.com'

Windows Live Mail Error ID: 0x800CCC92

Protocol: POP3

Port: 995

Secure(SSL): Yes

I have changed nothing. One day last week it just stopped working all the time. I've checked my pop3 settings and all the passwords and security things and made sure my yahoo mail account was up to date with the payment for Yahoo! Mail Plus. Does anyone have any ideas?

Why does my business keep disappearing from google maps? One day it is listed and the next day it is not. Then it's back up again the next day. It hasn't been delisted as far as I can tell for being in violation of anything or it would not return in the listings over and over again. I need it to be stable since I made a mailing list for clients with a link to that ad.