Answer:
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.
Give it food and it will live, give it water and it will die.
What word looks the same upside down and backwards?
If lightning strikes an orchestra who is the one most likely to get hit?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?