Your battery has to be either Nickel-Metal Hybrid (NiMH) or Nickel-Cadmium (NiCD) in order for this method to work. If you do this method with the wrong battery, the battery will likely be destroyed. All Macs have lithium batteries, and many modern Windows computers also use lithium batteries. You shouldn't perform this process on a computer with a non-removable battery, as doing so will either require you to remove the battery (which can void your computer's warranty) or freeze the whole computer (which will ruin your computer). Your laptop must be completely turned off and unplugged before you attempt to remove the battery, as failing to do so may result in an electric shock. In most cases, you'll remove the bottom of the laptop and unclip the battery from there, though your laptop may have a battery release button on the bottom instead. You'll want to do this to add a buffer between your battery and the second bag you'll use. This will ensure that the battery doesn't get damp while freezing. Avoid using a regular plastic bag for this, as the battery may accumulate moisture in such a bag. Doing so will give the battery enough time to restore at least part of its lifespan. You can leave the battery in for as long as 12 hours, but leaving it in any longer than that may cause the battery to leak. Once your battery has spent enough time in the freezer, you can remove it, dry it off if needed, allow it to come back to room temperature, and then plug it back into your laptop. You should be able to charge the battery from there.

Summary: Make sure you don't have a lithium battery. Turn off and unplug your laptop. Remove the battery. Place the battery in a soft cloth bag. Place the bagged battery in a Ziploc bag. Leave the battery in the freezer for 10 hours. Recharge the battery.

Imitating the normal night-time routine that you follow at home even though you are traveling can promote relaxation and rest, as your brain associates these activities with sleep. Do what you usually do at night - use the bathroom, brush your teeth, wash your face, change into sleep attire and read a book or watch a movie to help you drift off. Turn off screens one hour before you want to fall asleep. The blue light they release affects our ability to fall asleep. Even in coach seats there are a few key things you can do to get comfortable. Be aware of your body temperature. On planes, cabin temperature can vary considerably even during a single flight, so wear lighter layers that can be taken on and off easily. Wear lose-fitting clothing in natural fibers that will allow your body to breathe and release heat. A hat or a hood may also be a good way of keeping light out of your eyes. Get some comfy socks. Research suggests that wearing socks can promote sleep because heating cold feet causes the blood vessels in the feed to dilate (known as vasodilation). This signals to the brain that it can redistribute heat throughout the body and prepare for rest. Bring comfortable shoes for the train. Shoes are required to be worn at all times on Amtrak trains so pack some light plastic sandals or other comfortable footwear for the journey. If you have a sleeping bunk on a train, you can expect pillows and blankets be available. Some airlines also provide them. A neck pillow is important if you are unable to fully recline because as we fall into a deep sleep the muscles in our body relax more and more. In a seated position, therefore, it is more difficult to fall into a deep sleep because the neck muscles have to keep working to support our heads. Use the classic U-shaped travel pillow. Experts suggest using it the other way round, with the back of the pillow against the front of your neck. This will stop you jerking awake as your head falls downwards and could help with neck cramps. Bring blankets to keep you warm. On an airplane, buckle your seat belt over the blanket to avoid being woken up by cabin crew if the seatbelt sign goes on. Avoiding certain foods that inhibit good sleep and trying to eat at regular meal times can help you get some rest. If you drink alcohol, limit it to one drink. Even though alcohol helps you fall asleep, it reduces REM (rapid eye movement) sleep which is the most restorative, so you will not sleep as deeply. Don't consume caffeine before or during the flight as caffeine is a stimulant and inhibits sleep. Be aware that it can take up to 6 hours for caffeine to be eliminated from the body. Sip water to stay hydrated but not enough that you constantly need to use the bathroom. Try to eat at regular times, as your internal body clock affects your digestion. It can be difficult to sleep after a heavy meal or if you are hungry. There are several you can do while in your seat. For example, deep muscle relaxation exercises where you flex or clench your muscles and then gradually focus on letting go and relaxing them can be very effective. Start with the muscles in your toes or fingers and then move carefully around the body, by the end you will feel a deep sense of relaxation. Deep breathing helps achieve a state of relaxation conducive to sleep. Focus on maintaining a steady inhale and exhale. If you find this difficult, try the 4-7-8 technique, where you inhale through your nose for four seconds, hold your breath for seven seconds and then exhale through your mouth for eight seconds. Repeat until you fall asleep.

Summary: Follow your usual sleep routine as much as possible. Get as comfortable as possible. Use pillows and blankets. Watch what you eat and drink. Try some relaxation exercises. Do some breathing exercises.

If you're new to doing a 180 on your skateboard or haven't done the trick in a while it's a good idea to get your body used to being in the proper position. Practice skating around for a bit by pushing off and then situating your body into the right position. The ollie is the most fundamental skateboard trick and it's incorporated into pretty much every trick you'll do. And the 180 is an ollie where you turn your board and body 180-degrees. For the 180 you'll be turning around either behind you for a backside 180, or in front of you for a frontside 180. Once you have the ollie down, you're well on your way to doing a 180 skateboard trick! If you ride "regular" you will have your right foot in the back positioned on the tail of the board. If you ride "goofy" then your left foot will be in back on the tail. You want to position your back foot on the tip of the tail. To do a 180 on the skateboard, you'll want to position your back foot on the corner of the tail. For a straight ollie your front foot will be centered about halfway up the board or slightly back. You also want to put more pressure on the outer edge of your foot (the side your pinky toe is on). To help you with turning, plant your front foot so its slightly hanging over the opposite edge of board from your back foot. This may feel awkward but it will help to keep your board balanced when you're in the air. Your shoulders and your upper body is where most of the work will come from when you perform your 180. By setting your shoulders correctly you will be able to turn your body quickly enough and this should allow your legs and the board to follow. You might be tempted to try and force the board to turn using mostly your legs, but you won't get enough torque this way. For a backside 180, position your front shoulder slightly in front of your chest and dip it down so when you pull up you have more momentum to work with. For a frontside 180, you want to position back shoulder in front of your chest and dip it down as well so you can pull up and create momentum. You don't want too much of a bend so that you end up crouching too low as that won't allow you to pop high enough. You should stand with relaxed knees like you're getting ready to hop slightly. If you are bending correctly you should be able to slide your front forward up the board with ease.
Summary: Practice getting into the ollie 180 position. Position your back foot for an ollie. Position your front foot for an ollie. Set your shoulders. Bend your knees.