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2. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula ...

3. List of Billboard Hot 100 number ones of 1966 - Wikipedia

   en.wikipedia.org/wiki/List_of_Billboard_Hot_100...

   The Lovin' Spoonful scored a #1 hit with "Summer in the City" in 1966. The Four Tops scored a #1 hit with "Reach Out I'll Be There" in 1966. These are the Billboard magazine Hot 100 number one hits of 1966. That year, 16 acts achieved their first number one song, such as Simon & Garfunkel, Lou Christie, Nancy Sinatra, SSgt.

4. Names of large numbers - Wikipedia

   en.wikipedia.org/wiki/Names_of_large_numbers

   This section illustrates several systems for naming large numbers, and shows how they can be extended past vigintillion . Traditional British usage assigned new names for each power of one million (the long scale ): 1,000,000 = 1 million; 1,000,0002 = 1 billion; 1,000,0003 = 1 trillion; and so on. It was adapted from French usage, and is ...

5. List of Billboard Hot 100 number ones of 1959 - Wikipedia

   en.wikipedia.org/wiki/List_of_Billboard_Hot_100...

   Billboard. Hot 100 number ones of 1959. Bobby Darin spent nine weeks at number one in 1959, the most by any act. The Billboard Hot 100 is a chart published by Billboard magazine which ranks the best-performing singles in the United States. In 1959, it was compiled based on a combination of sales and airplay data sourced from surveys of retail ...

6. List of Billboard Hot 100 number ones of 1978 - Wikipedia

   en.wikipedia.org/wiki/List_of_Billboard_Hot_100...

   These are the Billboard Hot 100 number-one hits of 1978. That year, 11 acts first hit number one, such as Player, Yvonne Elliman, Deniece Williams, John Travolta, The Commodores, A Taste of Honey, Exile, Nick Gilder, Anne Murray, Donna Summer, and Chic. Johnny Mathis, previously having hit number one prior to the creation of the Hot 100, earns ...

7. List of Billboard number-one singles of 1957 - Wikipedia

   en.wikipedia.org/wiki/List_of_Billboard_number...

   In addition, the Top 100 reported a tie for the number-one single for the issues dated April 20 and December 9, while the Honor Roll of Hits reported a tie for the number-one song for the issue dated November 4. Billboard also considered the following B-sides as sharing the number-one spot with its A-side on one of its charts: