How to Parallel Park Perfectly in One Try, According to Math

vinhdav, iStock / Getty Images Plus
vinhdav, iStock / Getty Images Plus

Even though not all driver’s exams require you to parallel park, sometimes real life does. For those times where you can’t call the AAA helpline, below is the mathematically accurate way to parallel park without a scratch.

The instructions are based on a formula [PDF] created by Simon R. Blackburn, a mathematician at Royal Holloway, University of London. He used the Pythagorean Theorem and a series of variables (the radius of the car’s turning circle, the distance between front and back wheels, the distance from the center of the front wheel to the front of the car, and the width of the already-parked car) to devise what he calls a “perfect parking” maneuver, in which the car swings directly into the empty spot with no additional wiggling required. If you plug values specific to your situation into the formula, it’ll tell you how long the parking space needs to be in order for you to parallel park perfectly.

As you’re probably thinking, it’s unlikely that you’ll be able to whip out your pocket yardstick and start measuring distances on the fly. So Men’s Health translated the math into four easy-to-follow steps:

    1. Pull alongside the car ahead of the spot you want and align your rear tires with that car’s bumper.
    2. Turn your wheel toward the curb as far as it will go.
    3. Back up until the center of your inside rear tire aligns with the street side edge of that forward car. Straighten the wheel and keep backing up.
    4. When your outside tire aligns with that same edge, turn your wheel out toward the street and keep reversing.

Hypothetically, your car should slide right into the spot and you can christen yourself a certifiable master of parallel parking. Having said that, a little wiggling never hurt anybody, and you can still consider your car successfully parked even if it takes you a few extra maneuvers.

And don't forget to check out these 15 other hacks to make your parking experience as perfect as possible, parallel or not.

[h/t Men’s Health]

5 Trouble-Shooting Tips to Keep Your Houseplant Alive

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iStock

Maybe you’ve heard that houseplants can help improve indoor air quality. Perhaps you’ve read that looking at plants can help you focus. Or maybe you just really like how that ficus looks in your living room. But buying a plant and keeping it alive are two different things, and the answer to your botanical woes isn’t always “don't forget to water it.” Here are five green-thumb tips to make sure your plant stays as leafy green as it was the day you bought it.

1. Don't overwater your houseplant.

You don’t want to neglect your plant, but it’s easy to go overboard with the watering can, and that can be just as harmful as forgetting to water your plant for weeks. A watering schedule can help you keep track of whether or not your plants need attention, but you shouldn’t water just because it’s Sunday and that’s when you usually do it. Before you go to water your plant baby, make sure it actually needs it.

Your plant’s water needs will vary based on the type of plant, its location, how old it is, and plenty of other factors, but there are a few rules of thumb that can put you on the right track. Lift the pot. If it’s heavy, that means that the soil is full of water. If it’s light, it’s dry. Dig a finger into the soil around its roots, making sure to feel beneath the surface. Still damp? Hold off. Dry? Grab the H2O.

If you really struggle to strike the right balance between too much and too little water, consider a smart plant system. And regardless of how often you water, make sure to use a pot with good drainage to prevent root rot.

2. Watch the temperature of the room your houseplant is in.

Be aware of where your plant is situated in the room, and whether there might be any temperature extremes there. Is your fern sitting right above the radiator? Is your peony subject to a cold draft? Is your rosemary plant stuck leaning against a window during a snowstorm?

As a rule, most houseplants can handle temperatures between 58°F and 86°F, according to a bulletin from the University of Georgia. The ideal range is between 70°F and 80°F during the day, and between 65°F and 70°F at night. Below 50°F, sensitive plants can suffer damage to their leaves. However, as with most plant advice, it depends on the species—tropical plants usually do well in higher temperatures, and some other plants are happier in colder rooms.

If your sad-looking plant is sitting in the middle of a cold draft or right next to the heater, consider moving it to a different spot, or at least a few inches away. If it’s near the window, you can also draft-proof the window.

3. Maintain humidity for your houseplant.

Be mindful of the kind of ecosystem that your plant comes from, and know that keeping it happy means more than just finding the right amount of sun. A tropical plant like an orchid won’t thrive in dry desert air. According to the Biology Department at Kenyon College in Ohio, a dried-out plant will look faded and wilting. You can immerse it in water to help it bounce back quickly. (Warning, though: A plant that’s getting too much moisture can look that way, too.)

If your home gets dry—say, when you have the heater on full blast in the winter or the AC on constantly during the summer—you’ll need to find a way to keep your plant refreshed. Your can buy a humidifier, or create a humidity tray by placing the pot on a tray of pebbles soaked in water. The plant will soak up the humidity as the water under the pebbles evaporates. You can also get a spray bottle and mist your tropical plants periodically with water. (But don't mist your fuzzy-leafed plants.)

Not sure how humid your house is? You can get a humidity gauge (known as a hydrometer) for less than $10 on Amazon.

4. Look out for bugs on your house plant.

Even if you do all of the above correctly, you can still struggle to keep a plant healthy due to infestations. Keep an eye out for common pests like spider mites, which will leave brown or yellow spots on leaves or make the plant’s color dull. If you discover these tiny mites (you may need to use a magnifying glass), wash your plant immediately with water to knock off as many mites as possible. Wash the plant with an insecticidal soap, too, but make sure the label says it’s effective for mites.

5. Repot your houseplant.

Healthy plants often outgrow their homes. if you notice that there are roots coming out the drainage holes at the bottom of your pot, or that water sits on the surface of the soil for a long time before draining down, or that your plant’s roots are coming up out of the soil, it’s time to upgrade to a bigger pot. Signs of a “root bound” plant whose root system is too big for its container can also include wilting, yellowed leaves, and stunted plant growth.

No matter what the size of your plant, it’s good to repot it once in a while, since the nutrients in the soil deplete over time. Repotting creates a fresh nutritional start and can help perk up unhappy plants.

If your plant looks unhealthy and you're still stumped, try consulting the website of a university horticulture department for other signs of plant distress and potential solutions.

Yale Is Offering Its 'Science of Well-Being' Course for Free Online

Chainarong Prasertthai/iStock via Getty Images
Chainarong Prasertthai/iStock via Getty Images

Even if you’ve heard that money or career success won’t necessarily make you happier, it’s still hard to resist the impulse to correlate your own well-being to external factors like those. Why are we so bad at predicting what will make us happy, and how can we figure out what actually does the trick?

These are just a couple questions you’ll be able to answer after completing “The Science of Well-Being,” a Yale University course currently being offered for free on Coursera. According to Lifehacker, the 10-week course consists of about two to three hours of reading and videos per week, and you can work at your own pace—so you can definitely take advantage of a free weekend to fly through a few weeks’ worth of material at a time, or postpone a lesson if you’re swamped with other work.

The class is taught by Yale psychology professor Laurie Santos, who will lead students through relevant research on how we’re wired to think about our own well-being and teach you how to implement that knowledge to increase happiness in your life. Since the coursework is task-oriented and the course itself is aimed at helping you build more productive habits, it’s an especially good opportunity for anyone who feels a little overwhelmed at how vague a goal to “be happier” can seem.

As for proof that this is definitely an undertaking worth 20 hours of your time, we’ll let the previous students speak for themselves: From 3731 ratings, the course averages 4.9 out of 5 stars.

Though the course is free, an official certificate to mark your completion—which you can then add to your LinkedIn profile—will cost you $50. Enroll on the Coursera website, and check out 23 other science-backed ways to feel happier here.

Mental Floss has affiliate relationships with certain retailers and may receive a small percentage of any sale. But we choose all products independently and only get commission on items you buy and don't return, so we're only happy if you're happy. Thanks for helping us pay the bills!

[h/t Lifehacker]

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