Generally, you need chemicals to remove polyurethane. Because these chemicals are often harsh, you need good ventilation to protect yourself. If you can, go outside to work. If you're working on floors, create cross-ventilation to help keep you safer. To create cross-ventilation, open the doors and windows in the room. Also, it's a good idea to set up one fan blowing inward and one fan blowing towards the outside to get the air moving. If you're working on a piece of furniture inside, you should put something down to shield the floor from drips. A plastic tarp underneath the piece of furniture should work well to provide protection. You can tape down the edges if you're worried about tripping. Paint stripper can do a number on you if you're not careful. You'll need rubber gloves to protect your hands. Wear goggles to protect your eyes. Finally, you'll need a vapor ventilator mask, also known as a respirator, available at hardware stores, so you don't inhale the fumes. You should also wear closed-toed shoes, long sleeves, and pants if possible. Chemical-based paint strippers, such as those with methylene chloride, are very effective. However, they're also more harsh on your skin and can cause respiratory problems if you're not careful. If you're worried about the effects, you can use water-based strippers instead, though they do take much longer to work.
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One-sentence summary -- Create cross-ventilation. Protect the floor. Protect yourself. Choose your paint stripper.

Try using leftovers from dinner in your bento boxes, and keep frozen foods on hand to quickly defrost in a pinch. You can also cook large batches of rice and use it throughout the week, and pre-slice enough fresh fruit and veggies to fill up a week's worth of bento boxes to make packing super convenient. If your bento box is made of heat-safe material, feel free to use food that needs to be reheated! Buying packaged foods that are already sliced or portioned can also make things easier. Bento boxes are big on presentation, so choose complementary colors and interesting textures for visual impact. Try to choose flavors that work well together. Keep the edges neatly defined and don't let clashing flavors mingle (e.g., don't put fried rice next to a pastry). For example, citrus flavors pair well with leafy greens. Strawberries and cream cheese are very complementary. Balsamic vinegar pairs wonderfully with root vegetables. Don't forget to add spices when you're packing it up to give the food a little more kick.
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One-sentence summary -- Pre-cook and pre-slice foods for easy assembly. Aim for a variety of different flavors and textures.

It's about the people who are true behind your back. This section features some "tests" that you can make use of to observe and note how your friend behaves when you're not there to defend yourself. These tests are all optional, and you can try one, two or all of them, or just skip this section -- do whatever you feel most comfortable with. Ultimately, your feelings will matter most, so if needed, just jump to Part 3. This provides you with the opportunity to find out what type of people your friend hangs out with or if they say anything bad about you or one of your closer friends. Be around where they hang out and just be quietly in the background, saying nothing and not drawing attention to yourself, keeping a nice distance away. Don't give away any clues you're watching them, and if they're not being such a great friend, they probably won't even notice you. They might say uncomplimentary things about you, or about someone else who is really close to you. Listen for verbal clues, and watch for physical and emotional clues as well. A good and trustworthy friend won't gossip about you and won't spread rumors or, even worse, lies. Does your friend keep all of your confidences? Do you ever hear of anything you only told this friend being spoken of by someone else you didn't tell? Test your friend. Tell him or her a fake secret you have, and see if your friend makes rumors about the matter or not. Make sure that your fake secret is scandalous enough but does not involve anyone but you. This is entirely optional and if it feels icky, weird or undesirable, just skip it. If you think it might help and you have someone willing to help out, it can be one more thing to add to the mix for your decision-making. So, the test is: Have a classmate or coworker talk about you in an unflattering way to your friend, and have the classmate or coworker record or tell you whatever he or she said. If your classmate or coworker can't record the response, be the one to observe your friend while the unflattering scene unfolds. If your friend defends you, that's a great sign of loyalty but if he or she agrees and starts dissing you back, then you know this person isn't being a true friend.
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One-sentence summary --
Remember that friendship is not about the people who are true to your face. Observe how your friend is when he or she doesn't notice you're about. Consider how your friend handles your confidences. Set up the trolling test.