Airplane lights | Why do airplanes have red & green lights at wing ends ?

Why green & red lights on wing ends ? Airplane lights

We all do know what headlights & side lights/indicators are for on our motorbikes and cars but what are those blinking lights on an aeroplane ? Why do we need them & other airplane lights ? Long time ago, I had this question that why aircrafts have flashing lights on…


How does a submarine work ?

What is submarine & why do we need it ? Imagine you are on-board a ship & what would be the worst thing that would happen to you ? – the water flooding inside the ship making it sink to the seabed…damn…! So we need something which ensures either it doesn’t sink OR even…