Tropical cyclone

A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain. Depending on its location and strength, a tropical cyclone is referred to by names such as hurricane (/ˈhʌrᵻkən/ or /ˈhʌrᵻkeɪn/), typhoon /taɪˈfuːn/, tropical storm, cyclonic storm, tropical depression, and simply cyclone.

Tropical cyclones typically form over large bodies of relatively warm water. They derive their energy through the evaporation of water from the ocean surface, which ultimately recondenses into clouds and rain when moist air rises and cools to saturation. This energy source differs from that of mid-latitude cyclonic storms, such as nor'easters and European windstorms, which are fueled primarily by horizontal temperature contrasts. The strong rotating winds of a tropical cyclone are a result of the conservation of angular momentum imparted by the Earth's rotation as air flows inwards toward the axis of rotation. As a result, they rarely form within 5° of the equator. Tropical cyclones are typically between 100 and 2,000 km (62 and 1,243 mi) in diameter.

Roman Saini

Dr. Roman Saini is an Indian educator, motivational speaker and was one of the youngest IAS officers. Saini was previously posted as Assistant Collector in Madhya Pradesh. Saini is the co-founder of Unacademy, an online portal which provides educational content to civil service aspirants.

In January 2016, Saini resigned from IAS to concentrate on his free education initiative Unacademy.

Early life and education

Saini was born in Jaipur, Rajasthan. He attended AIIMS, and cleared the AIIMS entrance exam at the age of 16. In 2013, at the age of 22, he cleared the Civil Services Examination in his first attempt and became one of the youngest IAS officers in India by securing an All India Rank of 18. He resigned in 2016 before the formal completion of his training.

Unacademy

In 2013, Saini created Unacademy, an online education portal for civil service aspirants, together with Gaurav Munjal. Unacademy provides free educational material to students through its website and video tutorials shared over YouTube. At present, the YouTube channel has more than 400 videos with over one lakh subscribers. In 2015, 10 students of Unacademy qualified civil services exam.