When Can I Stop Worrying about Dry Socket?
A dry socket is a common complication after tooth extraction. It occurs when the blood clot that’s meant to form in the socket is either damaged or …
When
When Was Gold Discovered
It is almost certain that gold was the first metal known to One reason for this is that gold is found in the free state, uncombined with …
When Were The First Posters Used
Posters are so named because they contain messages that are “posted” for people to see. Most posters call attention to a product, an event, or a service. …
When Was The Umbrella Invented
To us, it seems so natural to put up an umbrella to keep the water off when it rains. But actually, the umbrella was not invented as …
When Did Acrobats First Appear
An interesting thing about a man is that he has always liked to be entertained. From the very beginning of civilization, there have been acrobats, jugglers, animal …
When Did Chemistry Begin
Chemistry is the science used to find out what things are made of and how they can be changed. It was actually the desire to make certain …
When Did Man First Use Electricity
Today, of course, it is almost impossible for us to imagine living without electricity. But man has been able to use electricity only since 1800. In 1800, …
When Were Silkworms First Used
Silk is the thread or cloth made from the fine web of the silkworm, a certain kind of caterpillar. The web is actually a cocoon that the …
When Did Advertising Begin
If we of advertising as a way of spreading information in order to do business—we might say advertising began ages ago. When a man brings some of his …
When Did Tattooing Begin
The sailor who rolls up his sleeves and shows an arm tattooed with anchors, hearts, and mottoes, is actually wearing a form of body adornment that has …
When Did People Settle In Canada
The Canadian people are made up of different national stocks and races. The first known inhabitants of the country were the Indians. It is believed the Indians …
