Snowflake in the same micro-environment does not guarantee that each arm grow the same; indeed, for some crystal forms it does not because the underlying crystal growth mechanism also affects how fast each surface region of a crystal grows. Empirical studies suggest less than 0.1% of snowflakes exhibit the ideal six-fold symmetric shape. Very occasionally twelve branched snowflakes are observed; they maintain the six-fold symmetry. Snowflakes form in a wide variety of intricate shapes, leading to the notion that "no two are alike". Although nearly-identical snowflakes have been made in laboratory, they are very unlikely to be found in nature. Initial
Symmetrical tonic neck reflex Symmetrical tonic neck reflex The symmetrical tonic neck reflex (STNR) is a primitive reflex that normally emerges during the first year of an infant's life and is diminished by the age of 9-10 months. It is a bridging or transitional brainstem reflex that is an important developmental stage and is necessary for a baby to transition from lying on the floor to quadruped crawling or walking. In order to be able to do this the baby needs to have been successful in unlinking the automatic movement of the head from the automatic movement of the arms and legs to progress