October 2013

Sample Analysis at Mars Science: Data from NASA's Curiosity rover has revealed the Martian environment lacks methane. This is a surprise to researchers because previous data reported by US and international scientists indicated positive detections. Read more ....

Brain image If you got beat up by a bully on your walk home from school every day, you would probably become very afraid of the spot where you usually met him. However, if the bully moved out of town, you would gradually cease to fear that area. Read more ....

Galaxy picture Astronomers using NASA's Hubble Space Telescope and Chandra X-ray Observatory and telescopes on the ground may have found the most crowded galaxy in our part of the universe. Read more .....

Nanoparticles image Many viruses and bacteria infect humans through mucosal surfaces, such as those in the lungs, gastrointestinal tract and reproductive tract. To help fight these pathogens, scientists are working on vaccines that can establish a front line of defense at mucosal surfaces. Read more ....

Space weather effects on satellites Is your cable television on the fritz? One explanation, scientists suspect, may be the weather - the weather in space, that is. Read more ....

Cheetahs A study by University of Georgia ecologists has found that diversity in mammal immune system genes may have more to do with the opportunity to choose a mate than with exposure to parasites. Read more ....

Locked door Humour: Locked out of your own house can be an alarming eperience, especially if you are new to the neighbourhood where neighbours are yet to make your acquaintance. I should know because I have gone through that embarrassing situation. Read more ....

Going round in circles

Sports ground

My friend and I went to the sports complex after many years. The sight brought back many happy memories. In our younger days, the complex used to be our favourite haunt and we used to begin the day with a morning jog.

We thought of reliving those good old days. We decided to walk. We decided that we would walk in opposite directions so as not to come in each other's way while walking.

It was a circular track. We stood with our backs to each other at the same point and exactly at 8 am, we began walking. Now I am slower than my friend. I could walk at a speed of two rounds per hour while my friend completed three rounds per hour. We stopped walking at 9.30 am - we, therefore, walked continuously for one-and-half hours.

Can you tell how many times did my friend and I cross each other during the course of the walk?

Click here for the solution


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  • Union Public Service Commission - www.upsc.gov.in
  • IIT-Kharagpur - www.iitkgp.ac.in
  • Indian Statistical Institute - www.isical.ac.in
  • Indian Institute of Technology Madras - www.iitm.ac.in
  • Indian Institute of Management, Ahmedabad - www.iimahd.ernet.in
  • Indian Institute of Mass Commission - www.iimc.nic.in
  • IIT Bombay - www.iitb.ac.in
  • Indian School of Mines, Dhanbad - www.ismdhanbad.ac.in
  • Birla Institute of Technology, Ranchi - www.bitmesra.ac.in
  • Central Institute of Fisheries Nautical and Engineering Training - www.cifnet.nic.in
  • Indian Institute of Information Technology, Allahabad (Deemed University) - www.iiita.ac.in
  • Central Marine Fisheries Research Institute, Kochi - www.cmfri.com
  • Tata Institute of Social Sciences, Mumbai - www.tiss.edu