Polish President Lech Kaczynski and other important officials died in a plane crash last Saturday. The plane was flying in thick fog to Smolensk. It was taking the president, his wife and other officials to events marking the 70th anniversary of the massacre in the Katyn forest of thousands of Polish officers by Soviet secret police. The pilot repeatedly ignored control tower instructions to divert to another airport. The plane crashed while landing in Smolensk. All 96 passengers were killed. The plane crash is an ironic tragedy considering the purpose of the trip. But the real problem with the situation is that the president, army chief, central bank governor, members of the parliament and many non-governmental leaders are dead. The country will have to struggle to function as before. The disaster came as a shock to the nation. There's the saying 'Don't put all your eggs in one basket'. I think this is the valuable lesson learned from this tragedy. Poland's most important leaders were all on board. Had they travelled separately, this would not have been such a catastrophe for the country. It's important to keep this in mind when we make decisions or cope with different situations in daily life. We should always keep our options open. For example, during exam time, students devote all their energy to their studies to getting high marks. And when they don't, it's as if all hope is lost. But school is just a small part of life. It's not an essential step in the road to success. Over the years, there have been many success stories of people who did not receive a formal education, such as Richard Branson. That said, school is still the top responsibility of every student. But it shouldn't be a matter that occupies every waking, or even sleeping, thought. Next time you stress over something, remember the eggs and basket theory.