When Was the Thermometer Invented?
When Was the Thermometer Invented? The first practical thermometer or instrument for measuring temperature was invented shortly before the end of the 16th Century by...
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What Is Blood Plasma?
What Is Blood Plasma? Plasma is the liquid part of the blood, in which the red and white blood cells float. It is the red oxygen carrying cells that give the blood its...
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What Are Tears?
What Are Tears? Tears are made of salt water, as you will know if you have ever licked a finger after wiping them away. They happen when the gland which provides...
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When Was the First Patent Filed for a Drink-through Lid?
When Was the First Patent Filed for a Drink-through Lid? The disposable coffee cup lid falls squarely in the category of random, everyday objects that you might assume...
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Where Do Spiders Keep Their Webs?
Where Do Spiders Keep Their Webs? A spider does not have a ready made web. She spins one. If you are lucky, you may be able to watch the female spider doing this. The...
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