Of course, the study of microbes is not just about observation. We want to be able to manipulate and control them, just like we do with everyday objects.Today, our protagonist optical tweezers, is such a “catcher” can manipulate the virus!”Optical tweezers can clamp, manipulate and microprocess tiny objects such as cells, organelles and biological macromolecules, and accurately measure the forces applied on the captured objects.The new coronavirus that causes pneumonia can also be studied using sophisticated techniques such as optical tweezers.So why can light exert a force on an object to manipulate it?How do optical tweezers make it possible for light to manipulate particles?What applications have optical tweezers now?To answer this question, we need to briefly analyze why light exerts a “force” on an object.The light force, that is, the force applied to an object when light strikes it.It is well known that light has the dual property of both wave and particle, namely wave-particle duality.In the same way that a body is struck by a flying baseball, a particle of light, a photon, exerts a force on an object when it touches it.So why, you may wonder, have we not been knocked to the ground by strong daylight or searchlights?For example, if you put your palm directly in front of the sun’s rays, the force applied to your palm by the sun’s rays is one hundredth of the pressure you feel when you put a grain of rice on your hand.Obviously, it is very difficult to feel the pressure of light only from the point of view of force.Although macroscopic creatures like humans can’t feel the light, the tinier an object is, the easier it is to be shaken by the tiny forces.Red blood cells, a group of human cells or microorganisms such as bacteria and viruses are all very sensitive to light pressure.Tiny pressures from light can push tiny objects around without being damaged by the backlog.