To go beyond that, in what experts call tertiary recovery, it is usually necessary to make the remaining oil less viscous, which can be accomplished using heat, gases, chemicals and even microbes.

When Kern River Oil Field was discovered in 1899, analysts thought that only 10 percent of its unusually viscous crude could be recovered.

When someone is heavy sleepy, the water in his body lose because of sweat, then the water in blood decreases, and finally the blood consistency becomes high.

Any fluid, no matter how "thick" or viscous it is, begins to flow, even if imperceptibly, under the action of the slightest net shear force.

On hyperlipemia, preferably before meals because napping, nap may increase blood viscosity, blood vessels caused by blockage.