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www.reference.com/history/invented-second-d9ca4c10fd752f98

Who Invented the Second? The international unit of the second was first described by the Greco-Egyptian mathematician Claudius Ptolemy in his work "Almagest" around 150 C.E. He defined the second, or second-minute, as one-sixtieth of a minute.

en.wikipedia.org/wiki/Second

The second became accurately measurable with the development of mechanical clocks keeping mean time, as opposed to the apparent time displayed by sundials. The earliest spring-driven timepiece with a second hand which marked seconds is an unsigned clock depicting Orpheus in the Fremersdorf collection, dated between 1560 and 1570.

www.history.com/news/who-invented-the-elevator

Who invented the elevator? Author: Laura Schumm. Although elevators may seem like a modern invention, devices used to transport people or goods vertically have been around for thousands of years ...

www.timetoast.com/timelines/history-of-cell-phones--11

The first telephone was invented 1870 by Alexander Graham Bell. There was many others that looked into the invention of the telephone. The telephone switchboard was invented in 1876, which allowed for the formation of telephone exchanges, and eventually networks.

www.livescience.com/37538-who-invented-the-car.html

The history of the automobile is a long and winding road, and pinpointing exactly who invented the car is not a simple matter. But if you rewind the evolution of cars past GPS, past antilock ...

www.livescience.com/44765-who-invented-the-bicycle.html

While stories about who invented the bicycle often contradict one another, there's one thing that's certain — the very first bicycles were nothing like the ones you see cruising down the street ...

en.wikipedia.org/wiki/Five-second_rule

The five-second rule, sometimes also the three-second rule, is a western cultural food hygiene concept that states that there is a defined window where it is permissible to pick up food (or sometimes cutlery) after it has been dropped and thus exposed to contamination. Some may believe this assertion, whereas most people employ the rule as an amusing social fiction that allows them to eat a ...

www.scientificamerican.com/article/experts-time-division-days-hours-minutes

Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.

www.historyofvaccines.org/timeline

The story of vaccines did not begin with the first vaccine–Edward Jenner’s use of material from cowpox pustules to provide protection against smallpox. Rather, it begins with the long history of infectious disease in humans, and in…

www.historyworld.net/wrldhis/PlainTextHistories.asp?historyid=191

The Middle Ages, by a tortuous route from Babylon, inherit a scale of scientific measurement based on 60. In medieval Latin the unit of one sixtieth is pars minuta prima ('first very small part'), and a sixtieth of that is pars minute secunda ('second very small part'). Thus, on a principle 3000 years old, minutes and seconds find their way ...