user: Why do humans need sunshine?

assistant: It makes people feel warm. It also provides vitamin D to make people more energetic. Without enough sunshine, people can become depressed.

user: Why is Brazilian jiu jitsu an excellent martial art?

assistant: Brazilian jiu jitsu (BJJ) is an excellent martial art for a number of reasons.  BJJ is, first and foremost, a generally safe martial art.  BJJ does not emphasize or focus on striking techniques like punching and kicking, rather, BJJ focuses on use of leverage and body mechanics to control and subdue an opponent.  BJJ is accessible to almost anyone regardless of age, sex, or fitness level as the practitioner can determine how relaxed or aggressive to be during practicing the art.  BJJ is an excellent form of exercise and promotes cardiovascular fitness, flexibility, strength, endurance, and an overall sense of well-being.  Further, there are approaches to BJJ that resonate with people who are casual hobbyists as well as those that seek international competition- and all levels of studends across that spectru.  BJJ is easily a life-long endeavor that is safe, engaging, and also an excellent complement to striking based martial arts such as karate, kickboxing, and boxing.

user: Given a reference text about the Battle of Thermopylae, tell me when the battle was fought, who the battle was between, how many Greek and Persian forces there were, how the Persian army was able to flank the Greek forces and who won the battle?

assistant: The Battle of Thermopylae was fought in 480 BC. The battle was fought between the Persian Empire, led by Xerxes I, and a combination of allied Greek city-states led by Leonidas I of Sparta. There were approximately 7,000 Greek men led by Leonidas I and an estimated 120,000 - 300,000 Persian soldiers led by Xerxes I. The Persian army was able to outflank the Greek army because a local person named Ephialtes informed the Persians that there was an unguarded path that lead behind the Greek lines. The Greek army made one final stand but ultimately were unsuccessful and were over taken by the Persian army.