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 them & especially green & red lights on each of the ends of wings ! Ever noticed ? What are those lights ? What are they for ? So here they are & their reasons ! more “Airplane lights | Why do airplanes have red & green lights at wing ends ?”
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 after sinking, all be safe.
So in simple words – a Submarine is a vehicle which allows us to travel on water as well as deep inside the seas & oceans.
Also a submarine is used in military for protection purposes. more “How does a submarine work ?”