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In Minkowski's 1908 paper there were three diagrams, first to illustrate the Lorentz transformation, then the partition of the plane by the light-cone, and finally illustration of worldlines. [8] The first diagram used a branch of the unit hyperbola t 2 − x 2 = 1 {\textstyle t^{2}-x^{2}=1} to show the locus of a unit of proper time depending ...
Chips sold in markets were usually sold in tins or scooped out of storefront glass bins and delivered by horse and wagon. Early potato chip bags were wax paper with the ends ironed or stapled together. At first, potato chips were packaged in barrels or tins, which left chips at the bottom stale and crumbled.
As of February 2017, there were more than 400 hours of content uploaded to YouTube each minute, and one billion hours of content being watched on YouTube every day. As of October 2020 [update] , YouTube is the second-most popular website in the world, behind Google , according to Alexa Internet . [ 1 ]
Smith's Crisps were first manufactured in Australia in 1931 with an associate, George Ensor, in leased premises in Sydney's Surry Hills. They were originally made in 20 gas fired cooking pots, then packed by hand and distributed by Nestle confectionery vans. [23] Smith's Potato Crisps sold its early crisps in three penny packets, 24 to a tin ...
This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.
1959 – Luna 3 sends the first images of another celestial body, the Moon, from space, including its unseen far side. [179] 1962 – Mariner 2 Venus flyby performs the first closeup observations of another planet. [180] 1964 – Mariner 4 spacecraft provides the first detailed images of the surface of Mars. [181]
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The rapid expansion of space meant that elementary particles remaining from the grand unification epoch were now distributed very thinly across the universe. However, the huge potential energy of the inflaton field was released at the end of the inflationary epoch, as the inflaton field decayed into other particles, known as "reheating".