user: What is Bubble tea?

assistant: Boba tea is a very delicious drink originally from Taiwan. It started with cold milk tea with tapioca balls in the early 1990s. When the demand gets so popular, the boba tea store owner tries to be fancier by adding different toppings such as grass jelly, pudding cluster, aloe vera, red beans, gummy, mochi and fruit bites. In addition, many store owners become more creative by using different flavors of tea (black, green, oolong, jasmine and other fragrance tea)  as a drink base to outstand other competitors.

user: Do you have to get training to go scuba diving?

assistant: Scuba diving requires training, and normally people gain a scuba diving certification before doing this activity

user: What is the difference between speed and velocity?

assistant: Speed and velocity are different terms. Speed is a measurement of distance over time. Velocity is a measurement of distance over time in a direction. Speed is scalar and can only be positive. Velocity is a vector and can either be positive or negative. For example, an object moving at a speed of 50 km/h tells us only how quickly it is moving but not its direction. An object with a velocity of +50 km/h tells us its speed and that it is moving forwards. Conversely, an object with a velocity of -50 km/h tells us its speed and that it is moving backward.