Answer:
Trade-offs: Gaining some enjoyment is worth giving up some safety.
Explanation:
Opportunity cost also known as the alternative forgone, can be defined as the value, profit or benefits given up by an individual or organization in order to choose or acquire something deemed significant at the time.
Simply stated, it is the cost of not enjoying the benefits, profits or value associated with the alternative forgone or best alternative choice available.
The Big Idea Stefan is using is trade-offs: gaining some enjoyment is worth giving up some safety.
 
        
             
        
        
        
When we consider the growth of the earth’s human population from the years 8000 BCE until 2011, the curve of people, relative to the year, takes the form of the letter J.
Population growth in the world, has been happening at a rapid pace, leading us to a situation where the governments are trying to put in laws that could result in a hold to it. 
In the current times, the human population is experiencing an exponential growth even though human reproduction is still far below its biotic potential. If we need biotic potential to be achieved, females will have to be pregnant after every nine months and we will simultaneously be needing resources for the same.
To learn more about population growth, click
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Answer:
When you show someone an act of kindness they will pass it on. Although they might forget what you did, they will never forget how it made them feel. Your act of kindness will continue to change peoples lives every single day. It will never end
If you have ever witnessed or done a kind act for someone, you know it feels great. Has the person in front of you in the drive-through line ever paid for you or your parents' food? How did that make you feel? That person has never met you, they only did it because they wanted to be kind. 
Explanation:
 
        
                    
             
        
        
        
Sensorimotor stage
Tertiary circular stage is the sub stage of sensorimotor development which happens between 12-18 months of age. At this stage, the infant passes through tertiary circular reactions of innovation and curiosity. These circular reactions are the designs in which a child deliberately investigates new possibilities with the objects and frequently involve in doing new things and searching new events.