Atreatment that uses a combination of light stimulation and genetics to manipulate the activity of individual neurons is known as

Answer is: optogenetics.
Optogenetics is a biological technique that combines techniques from optics and genetics.Technique is used to control and monitor the activities of neurons.
It includes the discovery and enter into cells of genes that are responsive to light (sometimes laser light).

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on