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2. Speed of sound - Wikipedia

   en.wikipedia.org/wiki/Speed_of_sound

   The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a ...

3. Chegg - Wikipedia

   en.wikipedia.org/wiki/Chegg

   URL. chegg .com. [1] Chegg, Inc., is an American education technology company based in Santa Clara, California. It provides homework help, digital and physical textbook rentals, textbooks, online tutoring, and other student services. [2] The company was launched in 2006, and began trading publicly on the New York Stock Exchange in November 2013.

4. T-90 - Wikipedia

   en.wikipedia.org/wiki/T-90

   The T-90 has its origins in a Soviet -era program aimed at developing a replacement for the T-64, T-72 and T-80 series of main battle tanks (MBT). The T-72 platform was selected as the basis for the new generation of tank owing to its cost-effectiveness, simplicity and automotive qualities. The Kartsev-Venediktov Design Bureau from Nizhny Tagil ...

5. List of Ponzi schemes - Wikipedia

   en.wikipedia.org/wiki/List_of_Ponzi_schemes

   МММ was a Russian company that perpetrated one of the world's largest Ponzi schemes of all time. By different estimates from 5 to 40 million people lost up to $10 billion. The company started attracting money from private investors, promising annual returns of up to 1,000%.

6. Arizona - Wikipedia

   en.wikipedia.org/wiki/Arizona

   Arizona is the sixth largest state by area, ranked after New Mexico and before Nevada. Of the state's 113,998 square miles (295,000 km 2 ), approximately 15% is privately owned. The remaining area is public forest and parkland, state trust land and Native American reservations.

7. Amazon Prime Air - Wikipedia

   en.wikipedia.org/wiki/Amazon_Prime_Air

   Amazon Prime Air, or simply Prime Air, is a drone delivery service operated by Amazon. The service uses delivery drones to autonomously fly individual packages to customers, and launched in 2022. [1] The service currently operates in two cities in the US, with plans to expand into the UK and Italy in 2024. [2]