3. Give or receive a massage For centuries, saltpeter may be combined with food given it?s a preservative. Before the invention of the refrigerator, kitchens routinely salted meat to hold it edible throughout the long winter time. Today, the traditional cans of corned beef still contain saltpeter ? it has been man?s friend when used in moderation. Saltpeter first emerged in China about 2,000 years ago. Early experiments saw Chinese chemists having the best along with the worst results, according to your point of view. The compost heaps containing decomposing organic matter were covered and spiked with dung and urine. When the resulting "mess" was filtered and wood ash added, this became wonderful fertilizer and also the foundation of fireworks for celebrations. Later, naturally, it made explosives for war. The Internet could possibly be rife with virus alerts, phishing scams, worms and trojans, however, these threats happen to be slow to infect our mobiles. They can in principle (there was a worm on jailbroken iPhones), but by yet Android phones have not suffered a panic attack. There have been some scare stories about potential exploits in third-party software for Android mobile phones, but this is still the main topic of much debate.