Actual growing time for seeds will depend on what plants you've decided to grow. Planning around the last frost date for your area will help you determine when to start germinating the seeds. Read the packaging on the seeds you are planting to see if additional steps, such as soaking or chilling, need to be taken before they are planted. Check the Old Farmer's Almanac for growing dates specific for your region. Using a cell tray allows the seeds to grow without interfering with one another. Opt for cell trays that have drainage holes at the bottom if you can. They can be purchased at any gardening store. If your cell trays do not have drainage holes at the bottom, use a knife to poke holes in the bottom of each cell. This biodegradable option has perfect sized cells for planting and you may already have one in your home. After you've used all the eggs in a carton, poke a few holes at the bottom of each cell so the soil has good drainage.

Summary: Plan to start planting seeds between 6-12 weeks before the last frost date. Purchase a cell tray with drainage holes for an easy option. Make a seed tray out of a cardboard egg carton for a free alternative.

" " Your first line in the column will remain blank, because you cannot figure out a marginal cost based on no units of production. $40 minus $30. For example, 2 minus 1. For example, Marginal Cost=$10/1. In this case, the marginal cost is $10. Continue to subtract figures from the row above to figure out marginal cost for the remaining units of production.

Summary: Write out the formula "Marginal Cost=Change in Total Cost/Change in Total Quantity. Make a column to the right of total cost that says "Marginal Cost. Find change in total cost by subtracting the total cost in row 3 from total cost in row 2. Find the change in total quantity by subtracting the total quantity in row 3 from the total quantity in row 2. Plug your numbers into the formula. Write your marginal cost in the column on the second row.

I spy is a great way for parents and educators to teach younger children about letters and the names of different objects. To start, settle down somewhere that you can place objects in front of the child. In order for this game to work, the child needs to have already begun learning the names of different objects, because the game is used to reinforce that knowledge. Pick a household object, such as a toy, utensil, or stuffed animal whose name the child has learned. Place the object down in front of the child on the mat, floor, or tray. In this version of the game, the object isn't to get the child to guess what object you've chosen, but rather to encourage the child to come up with the name of the object you've put down. This game also works for older children who are in the process of learning a new language, and the game can be used as a learning exercise for foreign words. Just like if you were playing with older children, say the rhyme to give the hint. For this version of the game, focus on letters, and specifically the first letter of the object. As the child progresses and gets better with names and spelling, you can try going by the last letter of the object too. For instance: "I spy with my little eye, something that starts with the letter S" for a spoon "I spy something and it ends with the letter G" for a toy dog This game only works with familiar objects because the child already has to have learned what the objects are in order to be able to name them. If the child needs some more help, begin sounding out the name of the object one letter at a time. For the word "spoon," for example, sound out just sp first, then "spoo", until the child is able to come up with the word. As the child advances, you can progress to placing two or three objects down. Choose one particular object that you want the child to identify and name, and then say the rhyme and give the beginning letter. Make sure all the objects start with a different letter. Another advanced version is to lay down five or six objects, two or three of which start with the same chosen letter, and have the child identify and name all the objects that start with that letter. As the child's perception improves, you can stop placing objects down and start using objects in the immediate environment.

Summary: Get the child settled on a play mat or high chair. Select an object the child is familiar with. Give the hint. Let the child guess the name of the object. Advance to using two or more objects.

A flat area without any trees or buildings is best, like an open field or the beach. This experiment works best on a day with clear skies. Make sure you can still see the horizon when you're laying down. If you can't, look for a spot with a clear view. You want to stand up as soon as the sun sets beneath the horizon. When you do, notice how you can see the sun setting over the horizon again. Think about it: if the earth was flat, it wouldn't make a difference if you stood up quickly after the sunset the sun would still be gone below the flat edge of the earth. But since the world is round, standing up lets you see further over the earth's curve. That's why you're able to see the sunset twice! If you were to let the sun set again, and then quickly get up to a higher viewpoint, you could see the sunset for a third time!
Summary: Find a spot outside just before sunset where you can see the horizon. Lay down on your back and turn your head toward the sun. Wait for the sun to set and then quickly stand up to see the sun again. Ask yourself why a round earth makes this possible.