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History of timekeeping devices.
For thousands of years, devices have been used to measure and keep track
of time (timekeeping or timing). The current sexagesimal system of
time measurement dates to approximately 2000 BC from the Sumerians.
The Egyptians divided the day into two 12-hour periods, and used
large obelisks to track the movement of the sun. They also developed water
clocks, which were probably first used in the Precinct of Amun-Re, and later
outside Egypt as well; they were employed frequently by Persians and
the Ancient Greeks, who called them clepsydrae. The Zhou dynasty is believed
to have used the outflow water clock around the same time, devices which
were introduced from Mesopotamia as early as 2000 BC.
Other ancient timekeeping devices include the candle clock, used in ancient
China, ancient Japan, England and Mesopotamia; the timestick, widely used
in Persia, India and Tibet, as well as some parts of Europe; and the hourglass,
which functioned similarly to a water clock. The sundial, another early clock,
relles on shadows to provide a good estimate of the hour on a sunny day. It is
not so useful in cloudy wentho​

The Youth Olympic Games (YOG) is an international multi-sport event organized by the International Olympic Committee. The games are held every four years in staggered summer and winter events consistent with the current Olympic Games format. The first summer version was held in Singapore from 14 to 26 August 2010 while the first winter version was held in Innsbruck, Austria from 13 to 22 January 2012.[2] The age limitation of the athletes is 14 to 18.[3] The idea of such an event was introduced by Johann Rosenzopffrom Austria in 1998. On 6 July 2007, International Olympic Committee (IOC) members at the 119th IOC session inGuatemala City approved the creation of a youth version of the Olympic Games, with the intention of sharing the costs of hosting the event between the IOC and the host city, whereas the traveling costs of athletes and coaches were to be paid by the IOC. These Games will also feature cultural exchange programs and opportunities for participants to meet Olympic athletes.

Several other Olympic events for youth, like the European Youth Olympic Festival held every other year with summer and winter versions, and the Australian Youth Olympic Festival, have proven successful. The Youth Games are modelled after these sporting events.[4] The YOG are also a successor to the discontinued World Youth Games.

The Summer Youth Olympic Games ofSingapore in 2010 and Nanjing in 2014 each played host to 3600 athletes and lasted 13 days, whereas the Winter YOG of Innsbruck in2012 had 1059 athletes and lasted 10 days. Even though this exceeded initial estimates,[5][6] the YOG are still both smaller in size as well as shorter than their senior equivalents. The next YOG to take place will be the 2016 Winter Youth Olympic Games ofLillehammer.

Lynx – very nice predatory cat found in the forest. These wild animals are not completely understood by man, they are reserved and cautious, getting to them is not so easy. Given the nature of the forest cats remains completely obscure the fact that they are easy to put up with the next person, live close to human settlements and even not afraid to pay a visit to the villages. In the winter can freely use paths trodden people. A wild cat is very unusual, so it will be interesting to learn about how she lives in the wild, what it eats, how lynx is protected from enemies, how many kittens she is born in the year...