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'Good News': First Covid-19 Vaccine Tested in US Poised to Begin Key Final Check Those early volunteers developed neutralising antibodies in their bloodstream at levels comparable to those found in people who survived Covid-19. UPDATED ON:  JULY 15, 2020, 10:32 AM IST Associated Press Representative image. The first COVID-19 vaccine tested in the US revved up people's immune systems just the way scientists had hoped, researchers reported Tuesday — as the shots are poised to begin key final testing. "No matter how you slice this, this is good news," Dr Anthony Fauci, the US government's top infectious disease expert, told The Associated Press. The experimental vaccine, developed by Fauci's colleagues at the National Institutes of Health and Moderna Inc., will start its most important step around July 27: A 30,000-person study to prove if the shots really are strong enough to protect against the coronavirus. But Tuesday, researchers reported ...

×)Light is a form of energy. ×)Light is needed to see things around us. ×)We detect light with our eyes. ×)Light travels in a straight line. ×)Light selects the path which takes the least time to travel.This principle was first given by PIERRE DE FERMANT. ×)THE LAWS OF REFLECTION a) Angle of incident is equal to angle of reflection. b) The incident ray, the reflected ray and the normal lie in the same plane. ×)The plane in which the incident ray, reflected ray and the normal lie, is the plane of reflection. ×)The size of the object and the size of the image are equal in a plane mirror. ×)The size of the image seem to be decreased when we move the object towards the eye (or) away from the mirror.