Abstract: A method of pumping an oilfield fluid from a well surface to a wellbore is provided that includes providing a clean stream; operating one or more clean pumps to pump the clean stream from the well surface to the wellbore; providing a dirty stream including a solid material disposed in a fluid carrier; and operating one or more dirty pumps to pump the dirty stream from the well surface to the wellbore, wherein the clean stream and the dirty stream together form said oilfield fluid.

Abstract: An apparatus for whitening teeth comprises a mouth tray comprising a horseshoe-shaped trough sized to accommodate a dental ridge. A planar projection extends from the outer side of the trough so that its far end is external of the mouth. A light box containing a plurality of LEDs couples with the external end of the projection and illuminates the projection end. The mouth tray and projection are formed of a light-transmissive material to irradiate a peroxide gel in the trough to whiten the user's teeth.

Abstract: An apparatus for whitening teeth comprises a mouth tray comprising a horseshoe-shaped trough sized to accommodate a dental ridge. A planar projection extends from the outer side of the trough so that its far end is external of the mouth. A light box containing a plurality of LEDs couples with the external end of the projection and illuminates the projection end. The mouth tray and projection are formed of a light-transmissive material to irradiate a peroxide gel in the trough to whiten the user's teeth.

Abstract: A Gooseneck Trailer Lock that obstructs a trailer hitch coupling mechanism and prevents the attachment to the ball of a towing vehicle. The locking device is inserted into the coupling mechanism, the slide of the coupling mechanism is moved to the closed position causing the top portion of the lock to engage the ½ inch lip on the inside of the mechanism while the body of the lock remains in the 2{fraction (5/16)} inch opening of the slide mechanism, the non-drillable barrel lock is locked and the key removed. The entire coupling mechanism is filled, preventing the insertion of the towing ball, thus preventing an unattached trailer from being attached to an unauthorized vehicle. The locking device is simple, durable, effective, and easy to use.