Why Are Some Periodic Table Symbols Unrelated to Their Names?
Some periodic table symbols do not relate to their English names because older, traditional, or non-English root words, mostly in Latin or German, influence…
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Letters
How Is Caesar Cipher Used Today?
The Caesar Cipher is a basic technique for encryption. It substitutes certain letters of the alphabet for others so that words aren’t immediately recognizable.…
What Was the Pony Express?
The pony express provided a fast postal service between two cities in America — St. Joseph, Missouri, and Sacramento, California — from April 1860…
Where Was the First Postage Stamp Used?
The first Postage “label” or stamp was used in England in May, 1840, it was the world’s first adhesive postage stamp used in a…
Where Were Numbers First Used?
The earliest written numbers we know of were used in Egypt and Mesopotamia about 5,000 years ago. At first men reckoned by chipping notches…