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VCRs were popularized in the 1970s, but by the end of the 20th century, DVD players were beginning to replace them, making the VHS obsolete by the end of the first decade of the 21st century. The first airplane was flown in 1903. With the engineering of the faster jet engine in the 1940s, mass air travel became commercially viable.
3rd century BC: Archimedes uses the method of exhaustion to construct a strict inequality bounding the value of π within an interval of 0.002. 3rd century BC: Archimedes develops the field of statics, introducing notions such as the center of gravity, mechanical equilibrium, the study of levers, and hydrostatics.
2 Pre-20th century. 3 20th century. 4 21st century. Toggle 21st century subsection. ... These discoveries, inventions and modifications are evidence of the ...
4.2 20th century. 4.2.1 1900s. 4.2.2 1910s. ... The timeline of historic inventions is a chronological list of particularly significant technological ... 21st century ...
Such discoveries are often a multi-step, multi-person process. Multiple discovery sometimes occurs when multiple research groups discover the same phenomenon at about the same time, and scientific priority is often disputed. The listings below include some of the most significant people and ideas by date of publication or experiment.
20th; 21st; 22nd; 23rd; 24th; 25th; Subcategories. This category has the following 2 subcategories, out of 2 total. 0–9. ... Pages in category "20th-century inventions"
The modern-day provisions of the law applied to inventions are laid out in Title 35 of the United States Code (Ch. 950, sec. 1, 66 Stat. 792). From 1836 to 2011, the United States Patent and Trademark Office (USPTO) has granted a total of 7,861,317 patents [ 7 ] relating to several well-known inventions appearing throughout the timeline below.
20th; 21st; 22nd; 23rd; 24th; 25th; 26th; Subcategories. This category has only the following subcategory. ... Pages in category "21st-century inventions" The ...