<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["es", "en"].<end_of_turn>
<start_of_turn>user
A menudo se considera que la era nuclear fue iniciada por los científicos involucrados en el Proyecto Manhattan durante la Segunda Guerra Mundial. Este proyecto, que fue una tarea de investigación y desarrollo durante la guerra, condujo a la creación de las primeras armas nucleares. Entre las figuras clave de este esfuerzo se encontraban científicos como J. Robert Oppenheimer, a quien a menudo se hace referencia como el "padre de la bomba atómica", Enrico Fermi, y muchos otros. La primera prueba exitosa de una bomba nuclear, conocida como prueba Trinity, tuvo lugar el 16 de julio de 1945 en Nuevo México, marcando el comienzo de la era nuclear.<end_of_turn>
<start_of_turn>model
The "best" swimming pattern can vary depending on the context and the goals of the swimmer. For efficiency and speed, the front crawl (or freestyle) is often considered the fastest and most efficient swimming stroke. It is characterized by alternating arm movements and a flutter kick, with the swimmer's body rolling from side to side.

However, for different purposes, other strokes might be more suitable. For instance, the breaststroke is often recommended for beginners due to its relative simplicity and gentleness on the body. The backstroke is unique as it is performed on the back and can be a good option for those with back issues. The butterfly stroke is more challenging and requires significant strength and coordination, but it is very effective for building upper body strength and cardiovascular fitness.

Ultimately, the best swimming pattern depends on the individual swimmer's skill level, physical condition, and objectives.<end_of_turn><eos>