How much did an early mobile phone weigh?   Answer here

What is the most watched music clip of all time?   Answer here

 What is the oldest inhabited city in Europe?   Answer here

What emotion have rats been shown to experience?   Answer here

According to property experts in London, there are up to 1,000 what, entombed underground?   Answer here

What is considered to be the biggest seaborne invasion and the greatest military campaign the world has seen?   Answer here