tread

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The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Centimetres vs inches, metal rulers on a white background with clipping path.

15 Questions About Units of Measurement Answered

Franklin D. Roosevelt, who formulated the Four Freedoms.

7 Alphabet Soup Agencies that Stuck Around

Solar eclipse of the sun.

The Sun Was Eaten: 6 Ways Cultures Have Explained Eclipses

Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution

The Rise of the Machines: Pros and Cons of the Industrial Revolution

Hindu Holi Festival celebrations with colored water, powder and colorful flower petals thrown over celebrants at a Hindu temple in Mathura, Uttar Pradesh, India on March 24, 2021.

Holi: Festival of Colors

tread

staircase

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In staircase
…a step is called its tread and the vertical front its riser; steps are placed between strings that are inclined to the angle of the staircase; strings are supported by newel posts that also support the handrail, forming a balustrade.
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