In one sentence, describe what the following article is about: Combine a cup of heavy cream with two ounces of chocolate. Choose dark or milk chocolate based on your preference. Chop up the chocolate or simply buy chocolate chips and use those. In a pinch you could use cocoa powder, but the cocoa butter in the chocolate acts as a stabilizer and helps the whipped cream hold its shape. Put the mixture in the microwave for about 30 seconds on high and then stir. Continue to heat the mixture--15 seconds at a time--and stir until the chocolate melts completely. The mixture will start out looking grainy but will smooth out eventually. If you use dark chocolate, you'll need to blend the mixture particularly well to avoid flecks. Use an emulsion blender to get the smoothest consistency. Pour the mixture into the larger bowl that you'll use to whip the cream and place in the refrigerator for about four hours. Whip until soft peaks form and add sugar if you like. A good guideline to follow is 2 tablespoons of sugar for every cup of cream. You can stop right here or continue to whip until the cream forms stiff peaks. Serve immediately.
Summary: Combine the cream and the chocolate. Melt the chocolate. Refrigerate. Whip.

In one sentence, describe what the following article is about: Doubling time is a concept used for quantities that grow exponentially. Interest rates and the growth of a population are the most common examples used. If the growth rate is less than about 0.15 per time interval, we can use this fast method for a good estimate. If the problem doesn't give you the growth rate, you can find it in decimal form using CurrentQuantityPastQuantityPastQuantity{\displaystyle {
rac {CurrentQuantity-PastQuantity}{PastQuantity}}}. Example 1: The population of an island grows at an exponential rate. From 2015 to 2016, the population increases from 20,000 to 22,800. What is the population's growth rate? 22,800 - 20,000 = 2,800 new people. 2,800 20,000 = 0.14, so the population is growing by 0.14 per year. This is small enough that the estimate will be fairly accurate. Most people find this more intuitive than the decimal fraction. Example 1 (cont): The island had a growth rate of 0.14, written as a decimal fraction. This represents 0.141{\displaystyle {
rac {0.14}{1}}}. Multiply the numerator and denominator by 100 to get 0.141x100100=14100={\displaystyle {
rac {0.14}{1}}x{
rac {100}{100}}={
rac {14}{100}}=} 14% per year. The answer will be the number of time intervals it takes the quantity to double. Make sure you express the growth rate as a percentage, not a decimal, or your answer will be off. (If you're curious why this "rule of 70" works, read the more detailed method below.) Example 1 (cont): The growth rate was 14%, so the number of time intervals required is 7014=5{\displaystyle {
rac {70}{14}}=5}. In most cases, you'll already have the answer in terms of years, seconds, or another convenient measurement. If you measured the growth rate across a larger span of time, however, you may want to multiply to get your answer in terms of single units of time. Example 1 (cont): In this case, since we measured the growth across one year, each time interval is one year. The island population doubles every 5 years. Example 2: The second, spider-infested island nearby is much less popular. It also grew from a population of 20,000 to 22,800, but took 20 years to do it. Assuming its growth is exponential, what is this population's doubling time? This island has a 14% growth rate over 20 years. The "rule of 70" tells us it will also take 5 time intervals to double, but in this case each time interval is 20 years. (5 time intervals) x (20 years/time interval) = 100 years for the spider-infested island's population to double.
Summary: Check that the growth rate is small enough for this method. Multiply the growth rate by 100 to express it as a percentage. Divide 70 by the percentage growth rate. Convert your answer to the desired unit of time.

In one sentence, describe what the following article is about: When selecting a stem, you should look for young, green growth, as they have a better chance for taking roots when planted. Select a piece of stem with a few leaves on it. You want to be sure you're able to identify the nodes, which are places where a leaf meets the stem. You'll want to have enough length on the stem to plant it deeply within the soil so that it can form roots. It should have a few sets of leaves located along the stem. Once you've measured the stem, cut just below a node. The node will look like a knob in the stem where it connects to the rest of the plant. Make sure the node is still on the cutting. Avoid handling the cutting by its stem or node by gently holding onto one of the lower leaves. You can sterilize scissors by wiping them with rubbing alcohol. This is to prevent contamination of the cells located at the node. While the new plant needs leaves to provide energy through photosynthesis, too many leaves will compete with the plant's efforts to send out new roots. Lower leaves will touch the soil and likely cause the cutting to rot, so they can be removed. By doing so, you can prevent them from wilting while you work. This is especially important for cuttings taken outside, because the sun can cause them to lose water quickly when removed from their plant.
Summary:
Select a healthy stem with new growth. Measure the stem out to 5 to 10 centimetres (2.0 to 3.9in) long. Cut below a node with a sharp pair of sterilized scissors. Remove the lower leaves of the plant, leaving 1 or 2 pairs at the top. Gather your cuttings in a plastic bag containing a few drops of water.