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How To: Make a Powerful PVC Air Cannon with Coaxial Piston Valve

The video featured in this article demonstrates the function and design of a powerful form of air cannon that operates using a purpose made valve that opens very rapidly. This allows for a massive amount of pressurized air to be released at once to throw a projectile many hundreds of yards. The design of the cannon also allows the barrel and the air chamber to occupy the same space, and so it is very compact and manageable which makes for an enjoyable shooting experience.

How To: Get better grades

The only things that will get you into a good college is persistence, a will to learn, and of course… grades. If your grades are lacking that oomph they need to impress the schools and your parents, there's a few ways to aid in improving your scores. With a little effort and focus, your next report card will sport better grades.

How To: Help someone who is choking

Choking is the mechanical (either by foreign object or compression) obstruction of outside air flowing into the lungs. Learn about choking, including emergency treatments like CPR, in this medical how-to video. Remaining calm and performing one of the procedures below could help someone who is choking.

How To: Diagnose septic shock symptoms

Septic shock is a serious and often life threatening emergency medical condition in which the blood pressure is extremely low. Insufficient blood therefore reaches the body tissues and this means that not enough oxygen and nutrients are delivered to the body. Medical shock is a serious circulatory condition not to be confused with emotional shock or surprise. Learn more about shock and the symptoms in this medical how-to video.

How To: Treat spider bites

Spider bites can range from harmless to fatal, spiders themselves coming in many varieties. you're bitten by a spider, you should wash that area carefully with soap and water and do this several times per day until the skin is healed. You can also apply an ice pack wrapped in cloth or a cold wet wash cloth to the area that has been bitten. Learn more about spider bites in this medical how-to video.

How To: Melt Chocolate in Under 1 Minute Without a Stove

When I first moved to Los Angeles, I rented a bed in a tiny studio. I was too broke to afford my own place, so all I had was a mattress in someone else's apartment. Unfortunately, this person had no interest in cooking, and therefore no kitchen equipment whatsoever. To make matters worse, there wasn't even room for my kitchen equipment. Needless to say, I ate a lot of tubs of Trader Joe's hummus, and frequented a lot of taco trucks.

Food Tool Friday: One Knife to Rule Them All

When I was a senior in college, I shared a two-bedroom, one bathroom, microscopic kitchenette suite with three other girls. We all loved to bake and cook but were fully aware that we were in for a crowded year. We needed to use space efficiently, which meant carefully picking what kitchen equipment was absolutely necessary. As a full knife set was out of the question, we settled on a Shun Classic Ultimate Utility Knife whose praises my father had sung for a long time.

How To: Lose the freshman 15

It’s easy to gain a little extra weight in college but there are ways to defy this weight gain trend. It won’t work without will power but you can limit your unhealthy food intake and sneak in some unconventional exercise routines.

How To: Use Brazilian-style drum fills

World Fusion Drumming combines the energy and feel of rock, Latin, and world music with the technique and improvisational skills of jazz. In this installment from his video tutorial series on the rudiments of world fusion drumming, Berklee College of Music professor Skip Hadden will walk you through several Brazilian-style drum fills that will help you in approximating the sound of Brazilian percussion session.

News: You Don't Need Antibiotics for Pink Eye

Crusty, itchy, red eyes? There is a decent chance you could have conjunctivitis, or pink eye, an infection of the thin lining around the eye and the eyelid, caused by bacteria, an allergen, virus, or even your contact lenses. Whatever the cause — you call up your doctor to get a prescription to clear it up, right? Not really.

News: The Latest in HIV Prevention — Syringe Vending Machines in Vegas & On-Site Testing at Walgreens

It's about time people acknowledged that judging drug users would do nothing productive to help them. In the US this week, two new programs are launching that should help addicts be a little safer: Walgreens Healthcare Clinic will begin offering to test for HIV and hepatitis C next week, and Las Vegas is set to introduce clean syringe vending machines to stop infections from dirty needles.

How To: Hit line drives to the pull side with a tee drill

This instructional video provides basic tips on proper baseball hitting fundamentals. Specifically, in this tutorial you'll learn how to hit line drives to the pull side by using the tee. Whether you are a parent who is excited about getting your youngster or youngsters started out in t-ball, a teenager trying to improve your skills or even a college or professional player, these hitting basics hold true regardless of what skill level you are at.