user: How many cities in the world have a population exceeding 5 million people ?

assistant: There are 81 cities in the world with a population exceeding 5 million people, according to 2018 estimates by the United Nations. The U.N. figures include a mixture of city proper, metropolitan area, and urban area.

user: Tell me some key points about Narmada river from the given text.

assistant: 1.The  Narmada is the largest flowing river in madhya pradesh.
2.The Narmada is also known as Rewa or Narbada.
3.It is also known as life line of madhya pradesh and Gujarat.
4.The Narmada rises from the Amarkantak (m.p.)and drain into Arabian sea through the gulf of khambat.
5. It flows westwards over a length of 1312 km & forms boundary between North India & South India.

user: Why is Pickleball a popular sport?

assistant: Pickleball's popularity has been on the rise, thanks in large part to its low entry barrier. With elements of tennis, ping-pong, and badminton, players with experience in racket sports can easily pick up the game. The court is smaller than a tennis court, and the slower-moving ball allows for players of varying athletic abilities to participate with ease