What are good exercises to relieve knee pain?
It could be one of many reasons, but the most likely reason, if you have been to a doctor and it is not have any pre-existing medical conditions or bone problems, is that your IT bands are tight. If you use a foam roller you can relieve a lot of stress on your knees, foam rollers can also be used on your back and that will take a lot of stress off of your spine as well.
Why did the Japanese invade Pearl Harbor and why did they launch a surprise attack? Isn't that against the rules of engagement?
Some elements in Japanese military leadership believed that a surprise attack on the US navy based in the Pacific would be able to effectively knock the US out of being able to contest new Japanese gains in Asia and beyond. It is against the normal rules of engagement, and while this surprise attack is remembered as horrific and without honor, it should be noted that the Japanese learned this first strike naval policy from the British who destroyed the Danish fleet at Copenhagen without first declaring war, for fear that the Danes would join Napoleon and Britain would have to face a combined French-Danish navy.
Why did Britain invade the Falklands when it presented no real benefit?
One, Thatcher was facing reelection and would have most likely not been reelected had she not shown considerable strength and success in foreign affairs. Two, Britain in general was tired of being a non-contender in foreign affairs since the 1972 Suez Canal Crisis officially unseated them from being a world power