In Lawrence Weinstein and John Adam’s book, Guesstimation: Solving the World’s Problems on the Back of a Cocktail Napkin, we learn how to estimate the total length of all of the pickles consumed in the US each year, how many cells there are in a human body, how much electrical energy the US uses each year and much more. In celebration of Math Awareness Month and all the fun you can have with huge data sets, we’ll be posting problems from the book and the answers the following day. Join in the fun and post your guesses below in the comments field.

Remember — this is math that can be jotted down or performed in your head, so we’re not looking for exact answers.

# Question #1

#### If all the humans in the world were crammed together, how much area would we require? Compare this to the area of a large city, a state or small country, the US, Asia.

# Extra Credit

#### How much area would we need if we gave every family a house and a yard (i.e., a small plot of land)?