SOME INTERESTING FACTS

• MARCONI discovered radio waves.
• Birds can perch on the overhead power lines without receiving an electric shock because they do not touch the ground and so do not complete an electric circuit.
• Deuterium(sometimes called Heavy Hydrogen) is an isotope of hydrogen whose nucleus contains one neutron and one proton.
• The dolphin can remain under water for 20 minutes and can swim at a speed of 70 km per hour.
• A bat can listen to ultrasonic sounds.
• The potato originated in Peru.
• We produce about 200 billion red corpuscles every day.
• The dog is the oldest domesticated animal.
• HUBERT BOOTH invented the vacuum cleaner in 1902.
• The first practical type-writer was invented by Christopher Scholes and Charles Glidden in 1867. Scholes designed the QWERTY typewriter keyboard layout which is still in use.
• The highest death toll ever reported in an earthquake occurred in the eastern Mediterranean in 1201 AD, with an estimated 1100000 casualties.