Here below is a 250 MB hard disk drive from 1979.

Finally IBM discover new Hard Disk with more than 1Gb space in 1980. It was called the IBM 3380 and could store 2.52 GB. Its cabinet was about the size of a refrigerator and the whole thing weighed in at 550 pounds (250 kg)

Check below pic for Hard Disk past to future journey.

The difference between 1GB memory of 20 years ago and 1GB of now.

What to Do Before an Earthquake

• Make sure you have a fire extinguisher, first aid kit, a battery-powered radio, a flashlight, and extra batteries at home.
• Learn first aid.
• Learn how to turn off the gas, water, and electricity.
• Make up a plan of where to meet your family after an earthquake.
• Don't leave heavy objects on shelves (they'll fall during a quake).
• Anchor heavy furniture, cupboards, and appliances to the walls or floor.
• Learn the earthquake plan at your school or workplace.

What to Do During an Earthquake

• Stay calm! If you're indoors, stay inside. If you're outside, stay outside.
• If you're indoors, stand against a wall near the center of the building, stand in a doorway, or crawl under heavy furniture (a desk or table). Stay away from windows and outside doors.
• If you're outdoors, stay in the open away from power lines or anything that might fall. Stay away from buildings (stuff might fall off the building or the building could fall on you).
• Don't use matches, candles, or any flame. Broken gas lines and fire don't mix.
• If you're in a car, stop the car and stay inside the car until the earthquake stops.
• Don't use elevators (they'll probably get stuck anyway).

What to Do After an Earthquake

• Check yourself and others for injuries. Provide first aid for anyone who needs it.
• Check water, gas, and electric lines for damage. If any are damaged, shut off the valves. Check for the smell of gas. If you smell it, open all the windows and doors, leave immediately, and report it to the authorities (use someone else's phone).
• Turn on the radio. Don't use the phone unless it's an emergency.
• Stay out of damaged buildings.
• Be careful around broken glass and debris. Wear boots or sturdy shoes to keep from cutting your feet.
• Be careful of chimneys (they may fall on you).
• Stay away from beaches. Tsunamis and seiches sometimes hit after the ground has stopped shaking.
• Stay away from damaged areas.
• If you're at school or work, follow the emergency plan or the instructions of the person in charge.
• Expect aftershocks.

The Sahara Desert is the world's largest hot desert and is spread across 8.6 million square kilometers in Northern Africa. The average year round temperature in Sahara exceeds 30°C with the temperatures rising above 50 degree centigrade during summers and the winter temperatures falling below freezing point. With the daily temperature variation fluctuating anywhere between the values -0.5 to 37.5 degree centigrade, the conditions are really harsh and difficult to sustain life and this condition is further deteriorated due to the hot, dusty winds.

 The high temperatures during summer, scanty rainfall, and freezing winters, along with the severely dry weather make Sahara's weather very inhospitable. As a result, plant and animal population is sparse.

Plants and animals develop certain adaptations in order to adapt to life in the harsh desert conditions.

Desert plants possess very long roots that penetrate very deep into the earth, and their broad leaves are replaced with spines, and thick green stems in desert plants like cactus where the spines help in preventing excessive water loss while the stem performs photosynthesis as well as holds water for a very long time.

 

Xerophytes, grasses, shrubs, and trees comprise the common vegetation in the Sahara desert.

Desert animals rarely come out in the hot sun and instead stay underground during most part of the day and eat such foods which contain a lot of water content. The desert animals are also smaller in size which minimizes water loss from their bodies.

The animal species found in the Sahara include the desert hedgehog, gerbil, jerboa, cape hare, common jackal, dorcas gazelle, oryx, dama deer, Nubian wild, barbary sheep, anubis baboon, spotted hyena, sand fox, Libyan striped weasel, the slender mongoose, rattlesnakes, kangaroo rats, kit foxes and numerous species of frogs, toads, crocodiles, lizards, chameleons, skinks, cobras snails, brine and algae shrimps.

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