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Top 7 Water Powered Calculators Running on H20 Batteries
Water Powered Calculators and other devices have been around for quite some time now. Practical or not, these devices have been selling quite well as novelty products and business around the world have come up with innovative ideas and designs for them. I thought, It would be a great idea to make a list of all water powered calculators available in market. I did and then selected the top five of them for our readers. It has been a great 2 hour journey full of discovery and learning.
How does water powered calculator work?
Generally Two different metals have difference in electronegative charge. If we immerse them both in a fluid which has free floating ions (not pure water) then one metal electrode will preferentially attract ions causing a potential difference. If these metals are connected to an external circuit the process will create a very tiny amount of current in micro-amps range(Most calculator chips only require one or two micro-amps to operate). The process will run perpetually as the metal will continue to draw more ions from the solution until the fluid is exhausted or metal is fully oxidized. ( similar to a lemon battery)
The water is in fact not the source of the power. The electricity is produced by the difference in electrode potentials of the anode and the cathode which are inserted into the water (or potato/lemon). It’s just a battery, it looks a little bit different, but the clock draws a very small amount of current anyway. So in other words: the water powered calculators are actually powered by a dissolving of metals like zinc.
EMC’s Water Powered Calculator
This one is most elegantly designed calculator. It has a futuristic shape. looks like an alien on your desktop. can only be ordered in bulk and you can get your logo/name printed on it. min order qty is 25 and will cost you around 15 British pounds each. You can request a free sample here. It indeed makes a great business gift. Although I hate the small keys, over all it’s the best around. More Details here
How to wire a Cat-5 Cable with RJ45 connectors using wiring standards
This tutorial helps your understand how to wire a 10BaseT, 100BaseT or 1000BaseT connector with Category 5, 5e, 6, 6e cable and RJ45 connectors using USOC 568B wiring standards.
RJ45 is a standard type of connector for network cables. RJ45 connectors are most commonly seen with Ethernet cables and networks.
RJ45 connectors feature eight pins to which the wire strands of a cable interface electrically. Standard RJ45 pintouts define the arrangement of the individual wires needed when attaching connectors to a cable.
Several other kinds of connectors closely resemble RJ45 and can be easily confused for each other. The RJ-11 connectors used with telephone cables, for example, are only slightly smaller (narrower) than RJ-45 connectors.
Top 5 Gadgets of the Week 43 of 2008
We are back with another edition of Top 5 Gadgets of the Week for our readers. we hope that you will enjoy reading about these gadgets and my like to buy some of them. May be all of them..! Our team’s favorite is the iWear AV310 wearable display. Which one is your favorite? Do share with us through comments. Enjoy the Gadgets…
iWear AV310 Widescreen
Windows XP: Microsoft Releases Critical Patch MS08-067
Today Microsoft surprised everyone with release of its latest security patch for Windows XP customers. MS08-067 is a patch for a vulnerability in RPC Service. RPC is a critical Windows XP service that allows programmers to run code locally or remotely.
Normally Microsoft releases all its security patches on 2nd Tuesday of each month. That is why it is called “Patch Tuesday” by Systems Administrators. This is first emergency patch release by Microsoft since April 2007.
Here is an excerpt from Microsoft Website:
This security update resolves a privately reported vulnerability in the Server service. The vulnerability could allow remote code execution if an affected system received a specially crafted RPC request. On Microsoft Windows 2000, Windows XP, and Windows Server 2003 systems, an attacker could exploit this vulnerability without authentication to run arbitrary code. It is possible that this vulnerability could be used in the crafting of a wormable exploit. Firewall best practices and standard default firewall configurations can help protect network resources from attacks that originate outside the enterprise perimeter.
This security update is rated Critical for all supported editions of Microsoft Windows 2000, Windows XP, Windows Server 2003, and rated Important for all supported editions of Windows Vista and Windows Server 2008.
Good news is that there have been only very limited and targeted attacks to date. Also another new thing this time is that in combating vulnerability, Microsoft relied only on the feedback from its customers. which is good and new for Microsoft.
Download Latest Patch from Here Or Here
List of Free Linux/Unix Shell Account Providers
A Unix shell or Linux console is a personal account which allows users access to a command prompt on another machine. We mentioned those earlier in our Post about Linux Commands , With these accounts you can login to a remote server and execute commands on it. These accounts are normally accessed via SSH. Historically we used telnet for that but now telnet is fast becoming obsolete due to security concerns. These free shell accounts can be used to practice your Linux / Unix skills as well as making most out of IRC, Email, web hosting etc. 
The free Unix shell accounts listed below are all provided by not for profit organizations. The existence of these non-profit organizations is vital for Internet community.So it is not good to bring them down. (you know what I am talking about).
http://freeshell.org , http://sdf-eu.or
Server & services:
- two T3s lines
- SIGs, Music Compilations and Membership activities
- 10+ DEC Alphas (DS20L/DS10L) running NetBSD
- Supporter of the NetBSD project and The Computer History Museum in Mountain View California
- Members vote in new features
- Member contributed programs and tutorials
- 80MB (free), 600MB and 800MB disk quotas
- Membership perks (such as free admission to the Computer History Museum) Read the rest of this entry
