Chennai From 10,000 Ft Above Sea Level

Photographer Robert D Stephens has captured some breathtaking aerial images of Chennai from 10,000 ft above sea level. He has exhibited these stunning images through Madras Transit, which is a collection of 25 such astounding images with records of air pollution level that have been measured by the Tamil Nadu Pollution Control Board.

(Guide to read the pollution levels: O2 stands for Sulphur Dioxide, NO2 stands for Nitrogen Dioxide and RSPM is Respirable Suspended Particulate Matter, ug/m3 represents mass chemical/total volume)

1. Georgetown Grid

SO2-14 ug/m3

NO2-18 ug/m3

RSPM-85 ug/m3

2. MRC Nagar

SO2-14 ug/m3

NO2-18 ug/m3

RSPM-35 ug/m3

3. Madras Club

SO2-13 ug/m3

NO2-19 ug/m3

RSPM-31 ug/m3

4. Mount Road

SO2 - 16 ug / m3

NO2 - 21 ug / m3

RSPM - 89 ug / m3

5. Kapaleeshwarar Temple

SO2-15 ug/m3

NO2-20 ug/m3

RSPM-65 ug/m3

6. The roads as on April 2015

SO2-015 ug/m3

NO2-18 ug/m3

RSPM-86 ug/m3

7. Triplicane Assemblies

SO2 - 16 ug / m3

NO2 - 23 ug / m3

RSPM - 150 ug / m3

8. Venetian Vadapalani 

SO2-21 ug/m3

NO2-28 ug/m3

RSPM - 68 ug/m3

9. Kathipara Junction

SO2-16 ug/m3

NO2-20 ug/m3

RSPM-60 ug/m3

10. Race Course

SO2-15 ug/m3

NO2-17 ug/m3

RSPM-49 ug/m3

11. Adambakkam Lake

SO2 - 21 ug / m3

NO2 - 25 ug / m3

RSPM - 70 ug / m3

12. Marmelong Bridge

SO2 - 20 ug / m3

NO2 - 23 ug / m3

RSPM - 121 ug / m3

13. King Institute

SO2 - 13 ug / m3

NO2 - 19 ug / m3

RSPM - 31 ug / m3

14. Madras Port

SO2 - 13 ug / m3

NO2 - 17 ug / m3

RSPM - 65 ug / m3

15. The Island

SO2 - 14 ug / m3

NO2 - 18 ug / m3

RSPM - 85 ug / m3

All images credit: Robert D. Stephens

Find out if someone is stealing your Wi-Fi:

Half of our world is running on Internet right now. The first thing you think of when shifting to a new house is which Internet connection to subscribe for. And as rule, with such necessities come theft and trickery. It happens so many times, that you get a Wi-Fi connection, pay for a high bandwidth package, but you end up getting a slow Internet. Chances are, your Wi-Fi has been hacked, and one of your sucking up on your bandwidth for free.

Today’s hack is a demo on how you can find out if someone is stealing your Wi-Fi. Watch and learn:

How to remove scratches from your smartphone's screen

Just a couple of scratches on your smartphone’s screen tends to make it look a lot older than it really is! And once you get the display scratched, there’s no going back, unless you replace it with a new display or buy a new smartphone altogether.

However, today’s hack is a demo on how you can drastically reduce the scratches from your smartphone’s display. All the things required for this DIY are mostly available at home. Watch and learn:

Make a 3D holographic projector with your phone, tablet or TV: 

Holographic projection is nothing but a projection of an image on a transparent object. The object could be water, mist or something similar. In these videos below, we bring you a few methods where the image is not projected, but reflected off a transparent glossy surface, such as an acrylic sheet or glass, to create a 3D floating holographic object. The effect is awesome, best viewed in a darker or a low-light environment. To get a better and more realistic projection, we suggest you use better materials and a possible AMOLED display. Why wait? Watch the videos below.

Use a friend's Android to find your own

If you're away from the computer and lose your Android, your first reaction may have been to race home to check the GPS location of your device. With the recent update to the Android Device Manager, you can check the location from a friend's device instead.

If you lose your Android device somewhere, the easiest way to find it would be the Android Device Manager. From your Web browser or another Android device, you can ring your lost Android, lock it down with a new password, or completely erase it. But what if you don't have access to your computer, or even your other Android devices? That's the problem that the most recent update to the Android Device Manager aims to solve.

Now, instead of rushing home to your computer, you can locate your device from a friend's Android. The catch? Well, you must use one of your backup codes to log in if you have two-step verification enabled (and if you don't, what are you waiting for?! Do it now!) Basically, this is a friendly reminder that you should print them out and carry the codes with you.

If you do have your backup codes, here's how to find your device:

Pick the guest option from the account menu.Nicole Cozma/CNET

Step 1: Open the Android Device Manager app (or install it for your friend) and tap the username menu at the top. Pick Guest.

Use your backup code in place of the two-step verification code.Nicole Cozma/CNET

Step 2: Enter your Gmail and normal password that you'd use to log in at home. In the two-step verification box, enter one of your backup codes.

Note: Each code can only be used once. Also, if you generate a new set of codes, all previous codes are deactivated. Backup codes can be viewed and generated at this link.

Pick a device, and then choose ring, lock, or erase.Nicole Cozma/CNET

Step 3: Choose your device and then pick the necessary action to help you locate it. When you're done, tap Sign out at the top.

It is a bit of an inconvenience to carry around your backup codes, but at least they could help you find your device when you're away from the computer.