Monday, January 30, 2012

Easy Studio Lights


Sidebar: Build Your Own Studio Light
Studio lights are expensive, dangerously hot and power-hungry. But you can avoid these problems by building a pair of the fluorescent soft lights as shown.
Basically, the light is a cheap pair of shop fixtures affixed to plywood backing and elevated 2x4" legs and feet. A milk plastic diffuser distributes the light and a pair of switches allow you to work at either half or full power. The lamps and housing never get too hot to touch and with four 40-watt bulbs, the total wattage is only 160 watts.

Saturday, January 28, 2012

Holy cow, MacGyver!

DARPA-Funded Hacker's Tiny $50 Spy Computer Hides In Offices, Drops From Drones

A prototype of O'Connor's $50 F-BOMB with its case open. (Click to enlarge.)
Even more embarrassing than a student discovering your GPS tracking device on his car, as the FBI found out last year, is having to ask him to give the expensive piece of equipment back.
So security researcher Brendan O’Connor is trying a different approach to spy hardware: building a sensor-equipped surveillance-capable computer that’s so cheap it can be sacrificed after one use, with off-the-shelf parts that anyone can buy and assemble for less than fifty dollars.
At the Shmoocon security conference Friday in Washington D.C., O’Connor plans to present the F-BOMB, or Falling or Ballistically-launched Object that Makes Backdoors. Built from just the hardware in a commercially-available PogoPlug mini-computer, a few tiny antennae, eight gigabytes of flash memory and some 3D-printed plastic casing, the F-BOMB serves as 3.5 by 4 by 1 inch spy computer. And O’Connor has designed the cheap gadgets to dropped from a drone, plugged inconspicuously into a wall socket, thrown over a barrier, or otherwise put into irretrievable positions to quietly collect data and send it back to the owner over any available Wifi network. With PogoPlugs currently on sale at Amazon for $25, O’Connor built his prototypes with gear that added up to just $46 each.
“If some target is surrounded by bad men with guns, you don’t want to have to retrieve this, but you also don’t want to have to pay four or five hundred dollars for every use,” says O’Connor. “The idea is that it’s as close to free as possible. So you can throw a bunch of these sensors at a target and get away with losing a couple nodes in the process.”
Homemade as it may look, the F-BOMB is more than a hacker hobby. O’Connor says his one-man security consultancy Malice Afterthought received a Defense Advanced Research Projects Agency contract earlier this month to develop the devices as part of the Cyber Fast Track program, which awards small sums to inventors.
An F-BOMB hidden inside a carbon monoxide detector casing. (Click to enlarge.)
Despite its name, O’Connor says the F-BOMB is designed to be a platform for all sorts of applications on its Linux operating system. Outfit it with temperature or humidity sensors, for instance, and it can be used for meteorological research or other innocent data-collecting.  But install some Wifi-cracking software or add a $15 GPS module, and it can snoop on data networks or track a target’s location, O’Connor adds. As is often the case with these kinds of hacker projects, he says the devices are only intended for penetration testing–finding security flaws in clients’ networks in order to fix them–and wouldn’t comment on what DARPA might do with the technology.
That hasn’t stopped the 26-year old researcher from coming up with a few clever ways to deliver or hide the tiny spy computers. One version attaches to the Parrot Drone, an iPhone-controllable quadcopter, sucking power off the drone’s rechargeable battery and allowing the user to hover over a target, land it on a roof, or drop the F-BOMB from a hook attachment on the drone.
Another version fits inside a carbon monoxide detector, and can be plugged into a wall socket to hide in plain sight inside a target’s building. (As shown above) In use-cases where it’s not plugged in, the most basic version of the F-BOMB comes with a module of AA batteries that allow for a few hours of use, though O’Connor says he’s working on versions with more longevity.
“It can fit whatever use case you want,” he says. “Put it in a box of stale Triscuits in the office kitchen, and no one will touch it. Or hide it in a carbon monoxide detector and you can leave it there for months.”
O’Connor, who formerly worked for the DARPA-funded contractor SET and as a graduate student in John Hopkins’ sensor research lab, says he was inspired by a pair of talks at last summer’s hacker conference Defcon. One focused on systems for firing camera projectiles, while the other showed off the WASP, or Wireless Aerial Surveillance Platform, an adapted Air Force flying drone equipped with gear for cracking Wifi networks and snooping on cell phones.

While O’Connor says he admired both those projects, his own system is far cheaper. And just as important, he says, using off-the-shelf components means the computers can be left behind without its innards revealing who built it, as more custom-designed or expensive parts might.
“If you lose it, it’s not a big deal,” says O’Connor. “And if they take it apart, they don’t learn anything about you.”

Friday, January 27, 2012

Laptop vs. Tablet

Can You Replace Your Laptop With A Tablet?


August 11, 2011


Tablets are hip—everyone is getting one. But the question on many small business owners’ minds is: Can a tablet replace my laptop when I’m on the road?
The answer depends on what work you currently do on your laptop. A tablet is great for surfing the Web or watching videos, but it is not necessarily the best solution for every business task.
This list can help you decide whether you should start shopping for a tablet or need to keep lugging your laptop:
1. Surf the Web
Nearly every tablet offers touchscreen capabilities that make Web surfing more interactive—zooming in or out by “pinching” the content or spreading your fingers outward. Some tablets include built-in Wi-Fi while others offer 3G, which lets users access the Internet wherever there is wireless coverage. The 3G option usually includes a monthly fee for a carrier’s service plan. Once you’re online, you can get caught up on the news of the day, check your favorite websites and update your social networking pages.
2. Catch up on e-mails
Like laptops, most tablets can be configured to access company e-mail accounts. They work fine for sending short e-mails, but the smaller touchscreen keyboard makes it more difficult to compose longer e-mails. Many offer external keyboards—wired or wireless—to make typing easier. Organizational functions, such as flagging e-mails and creating or modifying folders, may not be supported on some tablets. So do your research if you use these features frequently.
3. Keep tabs on customers
Just as you can sync your e-mail from your desktop onto a tablet, you can also sync your contacts and calendars. Tablet-ready versions of SalesForce and other customer relationship management apps allow you to find contact information, update lead status and review customer activity when you’re on the go.
4. Write and edit documents
The light weight and long battery life of most tablets make them a good option for conferences and meetings. Applications are available that let you use your finger to write or draw on the screen (Penultimate) or even record sound (Evernote). Though good for taking notes, tablets generally aren’t as suited for more sophisticated word processing tasks. Most programs allow you to format text, bullet lists and insert photos, but may not offer tracking changes, adding comments or other advanced editing features. Some tablets however, can run full versions of Microsoft Word, so be sure to research what you need. If you plan to type a lot, get an external keyboard.
5. Work with spreadsheets
Most tablets offer some form of spreadsheet software, and even let you make charts and use formulas. Yet, not all tablet spreadsheet programs support working with macros and other more advanced functionality. You could also lose more complex formatting when you import spreadsheets from a different program. So, if your work involves intensive number-crunching or reporting, you may want to hold onto your laptop.
6. Give presentations
Tablets’ size and bright displays make them ideal for showing websites, videos or presentations. If you are presenting to a larger audience, you can connect the tablet to a projector, generally through an adapter. If you want to use a tablet to look at presentations that you created on another computer, be sure to check that fonts render correctly, since some styles may not be supported on the tablet.
7. Manage your website
If you use a Web interface to update and manage your website or blog, you should be able to access it on a tablet. Apps such as FTP On The Go can help you access your FTP server in order to change and upload files. There are also apps available for viewing analytics related to visitors, keywords and other data.
8. Use with peripheral devices
Many tablets don’t have USB ports or other connectors to hook up to printers, cameras and other peripherals—and those that do may lack the software to support those devices. There are some workaround options. For example, apps like PrintBureau and PrintCentral let you print directly to wireless printers.
Other tablet features include a longer battery life and instant-on capability. If you’re still undecided, you may want to test them out. Try using the keypad and navigating the Web, and make sure they run the programs you use the most when traveling. AT&T offers a variety of tablets that can help you be more productive when you’re on the road.

Thursday, January 26, 2012

Microsoft Excel: 10 Secret Tricks

Work Faster in Microsoft Excel: 10 Secret Tricks

Uncover hidden features, new uses for old tools, and handy workarounds to speed up your everyday work in the powerful spreadsheet application.

By Helen Bradley Jan 25, 2012 6:00 PM


Excel puts lots of great tools on your desktop, but what each one of them does isn't always obvious, especially since so many Excel features are hidden.
Would you like to create multiple lines of text within a cell? There's a keystroke for that. What if you want to reuse a chart's formatting on another chart, or print multiple worksheets on a single sheet of paper? Those aren't the only timesaving tools at your fingertips. Here's how to find and use them to work smarter in Excel.

1. Make New Text Lines in a Cell

When you need to start a new line as you're typing text in a cell, use Alt-Enter.
When you need to start a new line as you're typing text in a cell, use Alt-Enter.

As you've probably already discovered, when you’re typing text into a cell and you want to start a new line of text, the Enter key doesn't produce the desired result. Pressing Enter merely places the text in the current cell and then selects the next cell. Instead, to start a new line in Microsoft Excel, as you're typing text, press Alt-Enter. On the Mac, the key combination is Control-Option-Return.

2. Quickly Add Values in Cells

Need a quick tally of values in selected cells? Read it in the Status Bar.
Need a quick tally of values in selected cells? Read it in the Status Bar.

What do you do when you need a quick calculation, such as adding the values of two cells? Rather than typing a formula to do it, click once on the first cell to select it and then Ctrl-click the second cell. By default, the Status Bar--which runs along the foot of the Excel window--will show the result of adding the values in the selected cells (Sum). You can also view other calculations in the Status Bar by right-clicking the Status Bar and choosing from the calculations listed there; aside from Sum, you'll find Average, Count, Numerical Count (the quantity of cells selected that contain numerical values), Minimum, and Maximum.

3. Create a Reusable Chart Template

Once you create a chart template, you can use it to format any future chart quickly.
Once you create a chart template, you can use it to format any future chart quickly.

Creating a series of charts for a project, such as an annual report, usually means that you need to format all of the charts similarly. Create a chart template for the design, and you can use it to create and format new charts in a flash. First create one chart and format it as you want all of the charts to look in the future. To save the chart formatting and appearance (but not the data) as a template, choose Chart Tools, go to the Design tab, select Save as Template, and then type a name for your template. The entry in the Save As Type box should read 'Chart Template Files(*.crtx)'; if it doesn't, select that option from the drop-down list. Click Save.
To use this template to format a new chart, begin by selecting the data to chart. From the Ribbon toolbar, choose Insert, Other Charts, and then All Charts Types. Now click the Templates option. From the My Templates group, select the template you saved, and click OK. Your new chart will have the same formatting as the chart template, saving you from having to do the work again yourself.

4. Format and Chart Far-Flung Data

The first step in charting and formatting sets of data that are far from one another is to select the data you need.
The first step in charting and formatting sets of data that are far from one another is to select the data you need.

Here's another quick timesaver: When you want to format a series of cells that don't appear side by side, start by selecting the first block of cells and then hold the Ctrl key as you select the second and subsequent blocks of cells. You can then apply a format, such as a font change or fill color, to all the selected cells. You can use the same technique to chart cells that don’t appear side by side, as well. For example, if you need to create a chart from a table of data using the headings in the first column and the data from the fourth column, first select the headings in the first column. Then hold Ctrl as you select the matching data in the cells in the fourth column. Afterward, create a chart, just as you would any regular chart.

5. Keep an Eye on Data With a Watch Window

Using a Watch Window, you can view the values in cells not visible on your current screen.
Using a Watch Window, you can view the values in cells not visible on your current screen.

When you’re editing a very large worksheet, often you need to view how your changes in one area affect totals and other calculations in cells that currently sit off-screen, either farther down the page or on another worksheet tab. Instead of repeatedly moving back and forth from your working data area to the cells that show the results you're interested in, use a Watch Window to display the values of the cells in the other part of the worksheet as you tinker. To set up a Watch Window, click the left mouse button within one cell that you want to watch. From the Ribbon toolbar, choose Formulas, Watch Window. When the Watch Window dialog box appears, click Add Watch. Because you've already selected the cell, you simply need to confirm that the reference to it in the dialog box is correct, and then click Add.
Now return to the area of your worksheet that you're editing. As you do so, you'll see that the Watch Window floats atop the worksheet, allowing you to work on your data. While you edit, the Watch Window shows the other cells, reflecting the changes you're making. You can move and resize the Watch Window as you wish, and use the Add Watch button to view additional cells in the Watch Window--even cells on another sheet--so that you can track the results in multiple cells as you work.

6. Make Formulas Easier to Understand

Using named ranges makes writing and troubleshooting formulas easier in Excel worksheets.
Using named ranges makes writing and troubleshooting formulas easier in Excel worksheets.

Sometimes formulas are not as clear as they could be. A formula that looks like '=C2*C5', for instance, is much harder to understand at a glance than one that reads, say, '=TaxRate*C5'. You can create formulas that use names (like 'TaxRate') instead of cell references (like 'C2') if you give common names to the cell or cells containing data you use repeatedly in calculations. To name a range, click the cell or select the range of cells to name. From the Ribbon toolbar, choose Formulas, Define Name, and then type a name in the Name box. The name should start with a character, not a number, and although you can't use spaces, you can use an underscore character if you wish. Click OK.
For example, if you were to name a cell 'TaxRate', later on you could use that name in a calculation, such as in the formula '=TaxRate*C5', which multiplies the value in cell C5 by the value of the cell you've named 'TaxRate'.
You can easily access named cells or ranges later.
You can easily access named cells or ranges later.

When you have named cells on a worksheet, you can find any of those cells or ranges by clicking in the Name box, which appears at the far left of the Formula Bar under the Ribbon toolbar. Click the drop-down arrow in the Name box to view a list of all named ranges, and click one to go immediately to that area on the worksheet.

7. Format Large Values as Rounded Thousands and Millions

Use a custom format to show large numbers as rounded, simplified values.
Use a custom format to show large numbers as rounded, simplified values.

Large numbers, such as thousands and millions, are often easier to work with as a rounded number than the exact value. You can set the cells containing large values to the nearest number of thousands using a custom Excel format. First select the cell or range to round off. Next, right-click the selection and choose Format Cells, Number. From the Category list in the Format Cells dialog box, select Custom. In the Type box, type ###, "k" and click OK. This format will round up the number to a whole number of thousands and display it with the letter k after it. For example, the number 21,678.22 will display as '22k'. Likewise, to format a number in the millions, create a custom formula that reads ###,,"m".
In addition to using this number format in your worksheets, you can apply it when formatting the axes of your charts. To format a chart axis this way, right-click the axis and choose Format Axis. Then choose the Number group and set up your custom format by typing it in the Format Code box.
This format controls only how the numbers appear on your worksheet or chart axis, and does not affect the cell's value. Therefore, Excel will use the actual value in a cell when the cell is referred to in a calculation.

8. Print Multiple Sheets on One Page

One thing that’s impossible to do in Excel using any built-in command or option is to print data from multiple sheets in a workbook onto a single sheet of paper. Instead, Excel always starts a new sheet of paper for each sheet in the workbook.
You can assemble snapshots of data from multiple worksheets into one worksheet for printing on a single sheet of paper.
You can assemble snapshots of data from multiple worksheets into one worksheet for printing on a single sheet of paper.

You have a workaround, however, that involves using the Camera tool. To start, you need to add the Camera icon to a toolbar; the easiest one to use is the Quick Access Toolbar. Click the down-pointing arrow to the right of the QAT, and choose More Commands. From the drop-down list in the right panel of the Excel Options dialog box, choose Commands Not in the Ribbon. In the panel below, select the Camera icon and click Add to put it in the QAT. Click Close. Then, select the first range to print, and take a snapshot of it by clicking the Camera icon. Move to a new worksheet, and click in the cell where the top-left corner of the snapshot should appear. Immediately, once you click there, the snapshot image will appear.
Now go to the second area that you want to print, select it, take a snapshot of it, and repeat the process of adding that snapshot to the same sheet as before. Continue to assemble all the data you need to print. Because the snapshots are all located on a single worksheet, you can now print them on one sheet of paper. Note, too, that the snapshots are linked to the original data, so if you make changes to the original data, the data in the snapshots will update automatically.

9. Borrow Table Formats for Your Excel Data

You can remove some table formatting while preserving the table itself.
You can remove some table formatting while preserving the table itself.

Using the 'Format as Table' command on the Home tab of the Ribbon toolbar applies a neat format to a list of data in Excel. Unfortunately, it also adds filters to your column headings and changes the behavior of columns and rows adjacent to the list. If you want the convenience and simplicity of applying table formats with a single click, but don't want the other features applied at the same time, you can easily remove the extras. To see this at work, select your list, including the heading row. Apply a table format to it by selecting the Format as Table option on the Home tab of the Ribbon. Click a table style to apply it to your list. When the Format As Table dialog box appears, select the My table has headers checkbox, then click OK--your data will be neatly formatted.
To remove the other features that Excel adds automatically to your list, keep the list selected. Choose Table Tools and then the Design tab, and select the Convert to Range option. When Excel asks, 'Do you want to convert the table to a normal range?' click Yes. This action removes the filters from the column headings, and removes other table-specific behavior, but leaves the formatting in place.

10. Create a Custom Data-Entry List

Use a Data Validation List to make selecting values to enter data into cells easy.
Use a Data Validation List to make selecting values to enter data into cells easy.

It's always quicker and more accurate to select an entry from a prepared list than to type the item yourself. So when you have a worksheet requiring common entries that could exist in a list, set them up that way. To create such a list, in an empty sheet in the workbook type the list of items to choose from, in one column. Return to the sheet where you will use these items, and select the range into which they will be entered. Choose Data, Data Validation, Data Validation, and then click the Settings tab. In the Allow drop-down menu, select List. Click in the Source area, navigate to the sheet that contains the data, and select the cells containing the items you just typed. Click OK to close the dialog box.
Now, when you select one of the cells to which you just added the Data Validation option, you'll see a drop-down arrow appear. From the list that appears when you click the arrow, you can select the item to enter into that cell.

Monday, January 9, 2012

This looks promising.

SpareOne: a cellphone that can run for 15 years

If your car's broken down, nursing your smartphone's short battery life can be a real nightmare when waiting for rescue. Of course, that might not be much of a problem if Xpal Power (the company behind Energizer and PowerSkin) has anything to do with it. It's developed the SpareOne, a super-cheap phone that runs from a single AA Battery and will reputedly maintain its charge for up to fifteen years. The dual-band GSM phone is designed for emergencies, transmitting its location alongside its call ID, or as a loaner phone for big corporate events. You'll get an Energizer AA battery and a microSIM in the bundle which will set you back $49.99 when it arrives at some point this quarter. At that price, we can imagine throwing a few in the trunk for breakdowns, when we're doing our Bear Grylls routine, or during the Robopocalypse.