Science Fact - 21

Sunday, November 2, 2014
Some facts about human hair:

  1. On an average, people have between 100,000 and 150,000 hairs on their head.
  2. Categorically, blondes have an average of 140,000 strands, brunettes of 108,000 and redheads of 90,000.
  3. Hair grows at a rate of about 150mm a year.
  4. The number of strands normally lost in a day varies, but on average is 100.
  5. Each individual hair lasts for two to six years before it falls out.
  6. If you are nervous that you are losing an excessive amount of hair per day, you can try this trick
Take about 60 hairs between your fingers and pull, running your fingers through your hair.  Usually between 5 and 8 hairs will come out—this is normal. An excess of 15 hairs, however, is not as common and means you are losing more hair than you should be.
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Science Fact - 20

Tuesday, September 30, 2014


The word 'robot' was introduced by the Czech interwar writer Karel Čapek in his play R.U.R. (Rossum's Universal Robots) in 1920.

However, Karel Čapek did not coin the word for the play, his brother did! Karel wrote a letter to the Oxford English Dictionary in which he named his brother, the painter and writer Josef Čapek, as its actual originator.

In an article in the Czech journal Lidové noviny in 1933, he explained that he had originally wanted to call the creatures laboři ("workers", from Latin labor). However, he did not like the word, and sought advice from his brother Josef, who suggested roboti. The word robota literally means corvée, serf labor, and figuratively drudgery or hard work in Czech. It also means work and labor in many Slavic languages (e.g.: Bulgarian, Russian, Serbian, Slovak, Polish, Macedonian, Ukrainian, archaic Czech). 


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3D Printed Ice-Cream: Ready in 15 minutes

Sunday, July 20, 2014

Ever wanted to have an ice-cream which is unique in shape than all others? Now your dream can be coming true! 

Three students from Massachusetts Institute of Technology (MIT) have developed a 3-D printer which can produce an ice-cream in any desired shape in just 15 minutes. By hacking together a soft serve ice cream maker, a freezer and a 3D printer, Kyle Hounsell, Kristine Bunker, and David Donghyun Kim created a machine that extrudes soft ice cream into any given shape then quickly freezes it with a blast of liquid nitrogen. 

The trio first needed to print into a cooled environment so that the ice cream would hold its shape once printed. "We bought a small upright freezer which was large enough to both put the Solidoodle inside and allow for the full build volume we were aiming for," Kyle Hounsell said. 

Source: Google Images
They then needed a gas to solidify the ice cream as soon as it came out of the extruder. They built a system to spray liquid nitrogen onto the ice cream as it was extruded."To ensure that the extruded ice cream ended up with constant characteristics, the cryogen line was bent in a circle to go all the way around the extruder and spray the liquid nitrogen evenly around the printed ice cream," they said.

Source: Google Images

"We were inspired to design this printer because we wanted to make something fun with this up and coming technology in a way that we could grab the attention of kids. We felt that it was just as important to come up with a new technology as it was to interest the younger generation in pursuing science and technology so we can continue pushing the limits of what is possible," Bunker told 3ders.org.

It's interesting to see the research focussed on generating interest in the younger generation as well. Hope we get to see these in ice-cream parlors soon!
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India Ranks 155 out of 178 Countries in Environment!

Thursday, January 30, 2014
India has ranked 155 out of 178 countries in Environmental Performance Index 2014. The 2014 Environmental Performance Index is a joint project between the Yale Center for Environmental Law & Policy (YCELP) and the Center for International Earth Science Information Network (CIESIN) at Columbia University, in collaboration with the World Economic Forum and support from the Samuel Family Foundation and the McCall MacBain Foundation.

What is EPI Rank?
The Environmental Performance Index (EPI) ranks how well countries perform on high-priority environmental issues in two broad policy areas: protection of human health from environmental harm and protection of ecosystems. Within these two policy objectives the EPI scores country performance in nine issue areas comprised of 20 indicators. Indicators in the EPI measure how close countries are to meeting internationally established targets or, in the absence of agreed targets, how they compare to the range of observed countries.


What are these Indicators?
These two objectives, Environmental Health and Ecosystem Vitality, are divided into nine issue categories that span high-priority environmental policy issues, including air quality, forests, fisheries, and climate and energy, among others. Underlying the nine issue categories are 20 indicators calculated from country-level data and statistics.


India's performance in these Indicators
India's performance in these indicators is below average but below is an image from their website which shows the trend as compared to last decade in each of the parameters. The health impacts and agriculture have increased as compared to last decade slightly but the major increase India has shown is in Water & Sanitation.



  1. Environmental Health

Health Impacts - India's Rank 127 
Health Impacts measures the probability of death between a child’s first and fifth birthdays. During this time, causes of death are strongly influenced by environmental factors, including air pollution, airborne particulates, and lack of access to clean drinking water. The probability of child mortality has decreased from 0.04 in 1990 to 0.01 in 2012 and thus our rank has improved which is a positive start. This shows that the health facilities in India have improved in the last decade. However, we still rank 127 in this indicator which should be improved. 
Health Impacts

Air Quality - India's Rank 174
Air Quality measures population-weighted exposure to fine particulate matter and percentage of the population burning solid fuel for cooking. It is a issue which has 3 parameters under it.
  1. Average Exposure to PM2.5 - The average exposure to PM2.5 value has increased from 19.83 to 31.98 in the last decade.  There has been a 40% decrement due to higher exposure of people to PM2.5.
  2. PM2.5 Exceedance - The score India has got is 0 out of 100! that's a shame! The value of PM2.5 exceedance has increased from 0.45 to 0.71 and it shows a 100% decrement due to high exceedances in the PM2.5 concentrations in the ambient atmosphere.
  3. Household Air Quality – Indoor Solid Fuel Usage - It measures the percentage of the population burning solid fuel (biomass such as wood, crop residues, dung, charcoal and coal) for cooking. Its value  has decreased from 87 in 1990 to 58 in 2010. There has been a 32.91% improvement in the last decade in this parameter. This shows people are moving to more refined products which are less polluting in nature.
Air Quality

Water and Sanitation - India's Rank 124
Water and Sanitation tracks percentage of population with access to improved drinking water sources and improved sanitation, including pit latrines and toilets. This index has shown an improvement of 54% in the last decade which is a tremendous achievement for our country.

This category includes two indicators: 
  1. Access to Drinking Water- This parameter takes into account the percentage of people who have access to safe drinking water. This has increased from 70.3 to 91.63 since 1990 which shows the accessibility of people to safe drinking water is increasing.
  2. Access to Sanitation - This parameter takes into account the percentage of people who have access to safe and secure means of sanitation. Our score in this is 6.2 out of 100 which is tremendously low, however there has been a 68% increment in the score in the last decade.
These indicators show that our water and sanitation problems are decreasing, however we have a long way to go. 

Water & Sanitation

2. Ecosystem Vitality
The parameters in Ecosystem Vitality include Water Resources, Agriculture, Forests, Fisheries, Biodiversity and Habitat, and Climate and Energy. Out of all these, only Agriculture has shown some improvement in these years. Agricultural subsidies and pesticide regulations have been imposed to a certain extent which is really important for a country like India as the main occupation here is agriculture.
Agriculture

In rest of the parameters, we have a long way to go to. Our environmental health is on an increase, so now we need to focus on ecosystem vitality. Climate, Forests, Biodiversity also need to be preserved for a better functioning of our ecosystem. In energy sector, we have shown improvement in the access to electricity by making it accessible even in remote areas. 
The following figure shows are performance in these rest of the parameters:
Ecosystem Vitality Indicators
155 out of 178! We surely need to work a lot harder to improve our Environmental Performance Index! 
All the data has been collected from EPI's website: http://epi.yale.edu/epi
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