Misc: What attack was planned & lead by Admiral Isoroku Yamamoto?

Questions

In what year were the Winter Olympics re-adjusted to take place midway between summer games instead of being in the same year?

What annually, according to a recent survey of council employees, is the time spent on cigarette breaks by the average smoker?

What was Rodney's middle name in Only Fools and Horses?

What is a narwhal?

Who had a 1981 number one with Don't You Want Me?