<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["en", "en"].<end_of_turn>
<start_of_turn>user
The nuclear age is often considered to have been ushered in by the scientists involved in the Manhattan Project during World War II. This project, which was a research and development undertaking during the war, led to the creation of the first nuclear weapons. Key figures in this effort included scientists like J. Robert Oppenheimer, who is often referred to as the "father of the atomic bomb," Enrico Fermi, and many others. The first successful test of a nuclear bomb, known as the Trinity test, took place on July 16, 1945, in New Mexico, marking the beginning of the nuclear age.<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>