Discovery of fire by early man

Discovery of fire by early man
Contrary to popular belief fire was not invented but discovered and tamed by man. When lightning struck a forest and created fire, it probably intrigued and amazed the early man. Many scientists believe that the controlled use of fire was most likely first achieved by our ancient human ancestor known as Homo erectus, and not Homo sapiens or Neanderthal as commonly believed. Homo erectus became the first hominin to master flames by accident, possibly in order to cook their food.

How did the control of fire lead to human evolution?
The control and manipulation of fire was a turning point for human evolution. It gave birth to cooked food. Cooking allowed the early man to consume more calories and, as a result, to develop larger brains.
Control of fire also helped one to ward off predators and venture into harsh climates. It also had important social and behavioral implications, like encouraging groups of people to gather together and stay up late.

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Electronic cigarettes

How do eCigarettes create vapour that mimics tobacco smoke and are they harmful?

Battery-powered cigarettes convert dissolved nicotine concentrate into vapour, which can then be inhaled without many of the toxic by-products associated with burning tobacco.

The electronic cigarette has three basic components: a chamber, an atomiser and a battery. The chamber contains nicotine and flavourings in a carrier liquid, such as propylene glycol. A wick, made from metal mesh or silica, draws the liquid into the atomiser, where it is heated by a battery- powered coil until it vaporises. The vapour is then inhaled and exhaled like tobacco smoke.

Electronic cigarettes are designed to simulate the feel, taste and nicotine hit of cigarettes, but their safety is debated. In many countries their manufacture and sale is unregulated, resulting in variation in their chemical contents. Their usefulness as nicotine replacement therapy is also largely unknown and the World Health Organization does not condone their use.

 

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What's in a Post-It note?

Each Post-It note has a strip of pressure-sensitive adhesive on the back. The adhesive enables notes to stick to a surface, but it does not bond too tightly so notes can be easily removed. The exact composition of Post-It adhesive is a closely guarded secret but chemists who have studied it believe the glue contains microscopic bubbles. These bubbles rupture under pressure, creating tiny vacuums that act like suction cups to stick the note to a surface. The notes will continue to stick after multiple uses until all the bubbles have been burst so no further vacuums can form.

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