The Grower bot…
Grower is a small ‘rover’ vehicle which navigates around the periphery of a room. It hugs the room’s walls and responds to the carbon dioxide levels in the air by actually drawing varying heights of ‘grass’ on the walls in green ink. The Grower robot senses the carbon dioxide (CO2) level in the air via a small digital CO2 sensor. This sensor is mounted high on a wall of the exhibition space and sends data wirelessly to the robot. The number of people in an exhibit space breathing in oxygen and exhaling CO2 has an immediate effect on the sensor. My robot takes a reading of the CO2 level every few seconds and in response it draws a vertical line in green ink on the wall. Thanks Doug! Link.
The main unit has four buttons. In order these are on/off, remote call disable, push to talk, and remote station select. The remote unit has two buttons. In order these are the call button and the privacy button (which disables the audio and the indicator lamp). Only one of these fancy remotes is supported; the other is just a plain loudspeaker with no call button or indicator lamp feature. 
I’m not on Sprint- let me know if this is useful. Most cell phones have a built in modem to allow for data transfer, all you need is a data cable and the cell modem drivers. Sprint has a decent data network that will give you access to approximately 240kbs of bandwidth, much faster that your standard dialup. [
While it was always possible (although costly and time consuming) to cobble together a PowerPC Mac from old and new parts, hardly anyone did it. Now that Apple has introduced OS X for Intel processors, however, it’s conceivable that you could soon be building your own Mac from scratch. One user, CEpeep, shopped around and found everything you’d need to build your own Intel Mac for under $200 – no rebates, no refurbs. Obviously, there are still many reasons why you’ll want to buy a true Mac – Apple quality and support (and innovation), the current lack of a legal x86 OS X, etc. But it’s interesting to think that the days of the do-it-yourself Mac may be just around the corner. 
Here’s a good post from 1993 on making a circuit to use old phones as inter-comms- Talking over the phones is easy. You put DC current through the phone and it transmits and receives audio. So two phones and a current source (about 25mA) all in series will give you a talking circuit. A suitable current source can be as simple as a 9V battery and a series resistor whose value is adjusted (with both phones offhook) till about 25mA flows. 
Why is this NES PC better you ask? Well, first off I went with a real Intel MoBo/CPU (As apposed to the VIA EPIA all-in-one boards). I also installed a GeForce 2 MX video card to allow me to play recent 3D PC games! Lastly I wired up the front controller ports to allow me to use my original NES controller with an NES Emulator! And I did this internally! This means no ugly wires plugged into the back of the NES looping back inside the case!…
