Disadvantages of In-Office Whitening. 1  In-office bleaching is more expensive than take-home alternatives. 2  Its cost, on average, is $650, compared to $400 for take-home trays and under $100 for over-the-counter bleaching trays or whitening strips.
Planetary protection is a guiding principle in the design of an interplanetary mission, aiming to prevent biological contamination of both the target celestial body and the Earth in the case of sample-return missions.
Valkyrie 77. Valkyrie 77, also referred to as the Pteranodon defense project, is a purple Pteranodon with teeth and a different crest. It has cracks in which light will occasionally flash and also has electricity pulsing from the animal as seen when it steps, attacks, gets up, or roars.