How many birds do domestic cats in the United States kill every year? You win if your answer is within an order of magnitude in either direction. However, you don’t actually win anything.
The answer comes from the journal Nature Communications as reported here
To reveal the answer, select the black box. (This assumes you don’t have black set as your selection color.)
And now for extra credit, within an order of magnitude, how many people subscribe to the online version of the Boston Globe? Hint: It costs $3.99/week. Hint: Greater Boston’s population is about 4M. Hint: This quarter, online subscriptions rose 8%. (The answer comes from an article at BizOnline.)
By the way, I occasionally like to acknowledge that the “order of magnitude puzzle” was invented by my famous friend Paul English.