SCIENCE AND TECHNOLOGY

• It is possible to see a rainbow as a complete circle from an aeroplane.
• A litre of vinegar is heavier in winter than in summer.
• A barrel of juice or wine would take about a year or two to ferment naturally into vinegar.
• It is easier to swim in a sea rather than in a river because the density of sea water is more compared to that of a river due to dissolved salts.
• Ambulances were developed by Napolean's surgeon in his Italian company of 1796-97.
• The world's most expensive water is heavy water used as moderator in nuclear reactors.
• TCDD is a man-made chemical which is 150,000 times more deadly then cyanide.
• Copper turns green when exposed to air for a pretty long time.
• Nitrous oxide can make you laugh. That is why it is called laughing gas.
• Saccharin is 500 to 700 times more sweeter than sugar.
• Solid carbon di oxide is called dry ice, because when it melts it does not change into liquid but vapourises directly.
• Ice does not melt when kept in liquid ammonia.
• Quick silver is not silver, but it is another name of mercury. It is so heavy that piece of iron floats on its surface.
• Perfumed talcum powder is made from mineral called Talc. It is the softest possible mineral known to man.