Think fast: What is the capital of Finland? Even if you don't know the answer, you probably like trivia. Whether you're watching "Jeopardy" or enjoying trivia night at the local tavern, a healthy store of trivia knowledge is an asset. Plus, a curious brain is a healthy brain. If you want to keep mentally fit, you need to exercise your synapses. Packing your memory banks with interesting bits of contemporary knowledge is a great way to work your brain and has the added bonus of making you a more informed person.