In one sentence, describe what the following article is about: To build a table jump, which resembles a long solid mound of dirt with inclines at each end, select a dirt-covered area that's clear of both trees and heavy brush. Clear away all of the vegetation, debris, and trash that may be in the area with a gardening hoe, and/or your hands, before you begin to build your table jump. The average dirt jump is 2ft (0.61m) high, with 4ft (1.2m) to 5ft (1.5m) between the take-off and landing ramps. Make sure to have at least 10ft (3.0m) of clearance from the edge of the take-off and landing ramps. Depending on your experience jumping your bike, you may want to start by building a small dirt jump say, 2ft (0.61m) high by 5ft (1.5m) long by 2ft (0.61m) wide, and work your way to large jumps as you practice more. Look for branches on the ground or saw branches off of nearby trees. Then stack your wood in a pile in the center of your planned jump to make it sturdy. Gather enough so that your pile is about half the volume of your dirt jump. For example, if your dirt jump is 2ft (0.61m) high by 5ft (1.5m) long by 2ft (0.61m) wide, gather enough wood to fill up a space that's 1ft (0.30m) by 1ft (0.30m) by 1ft (0.30m). Dig up a substantial amount of dirt from the surrounding area with a shovel and pack it into a wheelbarrow. Move the wheelbarrow towards your wood pile and pour the dirt on the wood. Repeat until you've created a mound 2ft (0.61m) high by 5ft (1.5m) long by 2ft (0.61m) wide. Pile the dirt on the wood, then pack it as tightly as possible. Shape your mound roughly into a rectangular cube. At opposite ends of the mound, dump more dirt enough to form slopes for riding up and landing. Shape and flatten each slope with the base of your shovel. Mold one end of the mound what will be your landing slope into a longer and steeper incline than the other. If you're a beginner, create a take-off slope that is 45 degrees or even more gradual. Form a landing slope at an incline of 30 degrees or less. The lip is a curve in your take-off ramp that will help you gain height as you accelerate towards your dirt jump. Take your front bike wheel and press it into one end of the mound what will be the take-off ramp in a few places. Using your shovel, shape the dirt of the take-off mound to resemble the curve created by the bike wheel. Using your shovel, pat down any impressions created by the tire ruts until the curve is completely smooth. Pat your shovel on the mound until it is as compact as possible. Then leave the dirt to harden for at least 4 days. After this time, examine how compact the dirt is. If the dirt falls off the mound as soon as you touch it, compress the dirt again with your shovel and hands, then let the mound sit for 2 to 3 more days. If the dirt is no longer loose, try riding up and down it with your bike! Your dirt jump will harden substantially as time passes. Rain will also help strengthen it. Consider watering your dirt jump by completely soaking it with a garden hose, then leaving it to set.
Summary: Select a flat area at least 30ft (9.1m) long for your jump. Build the foundation of the dirt jump with wood. Form the central mound with dirt. Shape each end of the mound into slopes. Create the lip of your take-off slope. Let your dirt jump set.

In one sentence, describe what the following article is about: Formatting your MacBook's hard drive will erase all of the data on it. Back up any documents, pictures, or other important files before formatting. You can copy the files to an external drive, burn them to a blank DVD, or upload them to your iCloud storage or other cloud storage service. You'll need an internet connection in order to download the necessary files during the format and reinstall process. Cmd+R as soon as it starts up. This will load the Recovery menu. This will open a new window, with all of your drives and partitions listed in the left frame. Select your startup disk to erase the partition that contains your operating system files. You can use the size of the partition to help judge the correct one. If you're getting ready to get rid of your Mac, you'll want to adjust the security options in order to securely erase the data on the drive. You may be presented with several different options, or a slider from "Fastest" to "Most Secure." Select the "7-Pass Erase" or "Most Secure" option to securely erase your data without any chance of retrieval. This will dramatically increase the amount of time the format process takes. This is the format required to install OS X on the Mac. The drive will begin the formatting process. If you didn't change the security options, it will only take a moment. If you chose a secure erase, it may take several hours to complete. " You'll need to be connected to a wireless network in order to proceed with the reinstallation. Follow the prompts to install OS X back on the computer so that you can use it again. The setup program will download all of the essential files automatically.
Summary:
Back up your important data. Ensure your computer is connected to the internet. Reboot your Mac and hold . Select the "Disk Utility" option. Select the partition that you want to format and then click the "Erase" tab. Click the "Security Options" button if you want to securely wipe your data (optional). Select "Mac OS Extended (Journaled)" from the "Format" menu. Click the "Erase" button. Close the Disk Utility window and click "Reinstall OS X.