Good puppies start long before breeding ever takes place. Both parents need long-term care -- what dog people call conditioning -- to produce the best offspring. This means regular veterinary care, screening for genetic problems, pre-breeding tests, and regular exercise and good nutrition.
A universally unique identifier (UUID) is an identifier standard used in software construction. A UUID is simply a 128-bit value. The meaning of each bit is defined by any of several variants. For human-readable display, many systems use a canonical format using hexadecimal text with inserted hyphen characters.
U is the mechanical energy used by the rocket between initial and final velocity (in other words, for a given delta-v). This amount of energy is less than the total chemical energy in the propellant, due to naturally occurring losses, such as waste heat generated by the rocket engine. is the acceleration of the rocket engine. u is the velocity of the exhaust gases relative to the rocket, which is approximately constant. dme / dt is the burn rate of the propellant. The right side of the above equation is derived using the same method that was used for deriving equation (1).