INPUT ARTICLE: Article: Children learn what they live, making it vital that parents set the right example with their own food choices. If parents are routinely eating and snacking on unhealthy foods, how can children be expected to do any differently? Setting the right example to get children to eat right requires parental self-discipline. Parents need to provide loving and firm guidance in making healthy and wise choices regarding food and snacks. It is most important to eat plenty of vegetables and fruits yourself. If you model positive behaviors, chances are your kids will copy you. Watch your body and facial expression as well when you try something new. In infancy, children often get fruit and vegetable baby foods, once they start eating table food, what you eat is going to be a big influence on what your kids like to eat. If you rarely serve vegetables with meals or eat fruit, don't be surprised if your kids develop the same habit. Children typically do not like changes being made to their routines, so expect children to express their dislike to newly implemented changes in the family meal plan. Calmly explain that "this is what we're having for dinner", and if children adamantly refuse to eat the planned meal, simply cover it and save it for when they say they're hungry. Remember, your home is not a cafeteria-style restaurant where children dictate what they will or will not eat. When the child later says they are hungry, simply say "Well that's good because I saved your dinner for you", then reheat as needed. For example, carrots have vitamin A which is good for skin and eyes. Make the connections between food and what it does for our bodies. For example, have them help when making salads or main meals together. They will be able to recognize what they are eating if they get to see it and feel it. It's also a great chance to discuss the food and get to understand its value better.

SUMMARY: Set the right example. Offer your children many different types of foods and let them see you eat and enjoy various foods, especially fruit and vegetables. Expect some resistance and be ready to deal with it. Explain to children what each vegetable contains by way of providing healthy benefits. Get the children involved with kitchen preparation.

INPUT ARTICLE: Article: Concrete cures best in temperatures above 50F (10C), so check the forecast for the next week. If you can expect warm temperatures, then now is the right time to pour the concrete. Pouring in the spring or summer is ideal to avoid any unexpected cold weather. If there is a sudden cold snap after pouring the concrete, professionals usually protect the concrete by building a structure around the site and using a portable heater. This is an expensive option, but it's the best choice to protect the concrete. While the concrete is curing, it can't handle excessive weight. Let it dry for a full 24 hours before stepping on it to prevent damage to the surface. If you're water-curing the concrete, take extra care to avoid stepping on it while you re-wet the fabric. If the concrete is in an area with a lot of foot traffic, block the area off and hang signs warning about wet cement. Make sure any pedestrians will know they can't step on the area. Even if the concrete looks dry, it can't handle excessive weight until after it cures completely. If the concrete is in your driveway or a similar area that cars drive on, wait at least 10 days before driving or parking your car on it. If you have a large vehicle like an RV or truck, wait 28 days before parking it on the concrete. Also wait 28 days if this is a commercial area with a lot of vehicle traffic, like a parking lot. The weight from multiple vehicles can cause the concrete to sink. Introducing new chemicals to the concrete before it's completely hardened can interfere with the curing process. Wait a full month before applying any paints or stains to the concrete. If you do want to paint the concrete and used a curing compound, remember to get one that is nonreactive with paint.

SUMMARY: Pour concrete when the temperature will be above 50F (10C) for at least 7 days. Wait 24 hours to walk on the concrete. Drive on the concrete only after 10 days have passed. Let the concrete harden for a full month before painting or staining it.

INPUT ARTICLE: Article: Tunnel boring machines, called TBMs for short or "moles," feature circular plates on the front called shields. Disc-shaped cutters on the shield tear through rock and dirt, which passes through openings in the shield onto a conveyor belt inside the TBM that deposit it behind the machine. The types of TBM shields vary according to whether the mole is to dig into soft, wet ground or hard rock. Shield diameters range from Aker Wirth's 26.3-foot (8.03 m) shield on its TBM used for Switzerland's Linth-Limmern power stations to Hitachi Zosen's "Big Bertha," with its diameter of 57.5 feet (17.5 m). Moles designed to dig tunnels below the water table also feature chambers at the front to pressurize the ground being dug through. For large jobs, multiple TBMs may be called for. The Channel Tunnel required 11. For a surface level tunnel, this is no problem. If the tunnel is to be bored deep underground, an access shaft, usually circular, is drilled and lined with concrete. The TBM is lowered into it, and the tunnel is excavated from that point. For long tunnels, multiple access shafts are drilled. When the tunnel is finished, the access shafts may become ventilation shafts and/or emergency exits. If they are not so employed, they are left in place for the life of the tunnel. Segments of pre-cast concrete are erected behind the TBM to form a ring at pre-determined intervals. The sprayed concrete, or shotcrete, coats and stabilizes the tunnel walls. The shotcrete may include steel or polypropylene fibers to strengthen it, much the way steel rebar is used to strengthen cast concrete. The shotcrete also contains an accelerant to help it stick to the tunnel walls and dry quickly.

SUMMARY:
Choose the right tunneling machine for the job. Get the machine into position. Erect tunnel supports as the machine bores through. Spray concrete on the excavated walls between the support rings.