Many of us like glass or crystal door knob at house, it’s beautiful and apparently harmless. But solid glass door knob may act like a convex lens and focus sunlight on flammable stuffs which eventually may catch fire because of concentrated sunlight. So consider the glass door knob as a convex lens, a flammable object exactly at focal length of the lens and sunlight is coming from opposite direction. It’s like your childhood days when you set fire to paper with magnifying glass.
In September last year Clare Thomson’s family house in UK caught fire when a glass door knob focused sunlight on nearby clothing. No one was at home that time but their neighbors noticed the fire before spreading.
According to London fire brigade, fire triggered by crystal or glass door knob is not uncommon. Their advice is to keep crystal or glass door knobs and mirrors with concave surfaces away from sunlight. Even glass fish bowls may cause fire by focusing sunlight.
Yes we are hot and as a result environment is getting hotter. Research and weather data have shown big cities like Melbourne, Tokyo and Moscow are hotter in weekdays than weekends. It’s because of the commuters who pour into cities in weekdays. Temperature rise is because of heat generated from human bodies, transports, private cars and buildings where many modern day gadgets and machines are in use. Dr. Nick Earl is an academic at the University of Melbourne in Australia. According to his study Melbourne is 0.30 C hotter in weekdays.
Around 250,000 commuters pour into the city in weekdays so their effect can’t be negligible. It’s like a cycle where temperature goes up and down and there is no weekly cycle in nature so commuters are to blame, say researchers.
Not only temperature but also rainfall, wind speed and cloud can be affected due to increased population. Rise in temperature increase convection which affects wind and pollution particles from cars influence cloud formation.
Researchers believe this new finding may be useful, it will give better understanding of meteorological cycles and now we can put ban on cars in cities during heat waves.
Gliders are very small and designed to fly without engine but when 100 ton Boeing 767 flies like glider and lands safely that’s amazing. It happened on July 23, 1983 when an Air Canada Boeing 767 was heading to Edmonton, Alberta from Ottawa. It was 2,800 kilometer trip.
While on sky captain Robert Pearson and Co-Pilot Maurice Quintal suddenly found they are running out of fuel. They had no hope to reach destination. When they lost both engines they had only one option that was to glide the aircraft like a glider and find a landing spot. At that time is was 12,500 meters above mean sea level.
They managed to glide the aircraft on an abandoned air force base. It’s not an easy task. When engine fails electricity also fails as a result many control systems on board fails. At the end one died and none of the 61 passengers and 8 crews were injured seriously. This aircraft got the nick name ‘Gimli’ because it landed on Gimli base.
And all these happened only because of a miscalculation. Ground crews thought they have fully refueled the jet but actually it wasn’t. That aircrafts computer system to monitor fuel level was not working so crews checked it manually. Canada has been using old British units but at that time they were in the process of introducing metric system. Their new aircrafts were also calibrated to metric system. Ground crews forgot the matter and calculated in old fashion. They filled only half of the fuel required and thought aircraft is ready for the flight to Edmonton.