{"fact":"When a cat chases its prey, it keeps its head level. Dogs and humans bob their heads up and down.","length":97}
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{"fact":"The oldest cat on record was Cr\u00e8me Puff from Austin, Texas, who lived from 1967 to August 6, 2005, three days after her 38th birthday. A cat typically can live up to 20 years, which is equivalent to about 96 human years.","length":220}
{"type":"standard","title":"Experimental testing of time dilation","displaytitle":"Experimental testing of time dilation","namespace":{"id":0,"text":""},"wikibase_item":"Q185897","titles":{"canonical":"Experimental_testing_of_time_dilation","normalized":"Experimental testing of time dilation","display":"Experimental testing of time dilation"},"pageid":2832880,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Time_dilation.svg/330px-Time_dilation.svg.png","width":320,"height":320},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Time_dilation.svg/480px-Time_dilation.svg.png","width":480,"height":480},"lang":"en","dir":"ltr","revision":"1292275927","tid":"19b3e849-39e5-11f0-bd0f-6c16713faa84","timestamp":"2025-05-26T03:54:19Z","description":"Tests of special relativity","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Experimental_testing_of_time_dilation","revisions":"https://en.wikipedia.org/wiki/Experimental_testing_of_time_dilation?action=history","edit":"https://en.wikipedia.org/wiki/Experimental_testing_of_time_dilation?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Experimental_testing_of_time_dilation"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Experimental_testing_of_time_dilation","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Experimental_testing_of_time_dilation","edit":"https://en.m.wikipedia.org/wiki/Experimental_testing_of_time_dilation?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Experimental_testing_of_time_dilation"}},"extract":"Time dilation as predicted by special relativity is often verified by means of particle lifetime experiments. According to special relativity, the rate of a clock C traveling between two synchronized laboratory clocks A and B, as seen by a laboratory observer, is slowed relative to the laboratory clock rates. Since any periodic process can be considered a clock, the lifetimes of unstable particles such as muons must also be affected, so that moving muons should have a longer lifetime than resting ones. A variety of experiments confirming this effect have been performed both in the atmosphere and in particle accelerators. Another type of time dilation experiments is the group of Ives–Stilwell experiments measuring the relativistic Doppler effect.","extract_html":"
Time dilation as predicted by special relativity is often verified by means of particle lifetime experiments. According to special relativity, the rate of a clock C traveling between two synchronized laboratory clocks A and B, as seen by a laboratory observer, is slowed relative to the laboratory clock rates. Since any periodic process can be considered a clock, the lifetimes of unstable particles such as muons must also be affected, so that moving muons should have a longer lifetime than resting ones. A variety of experiments confirming this effect have been performed both in the atmosphere and in particle accelerators. Another type of time dilation experiments is the group of Ives–Stilwell experiments measuring the relativistic Doppler effect.
"}