Jim Yardley and Elisabetta Povoledo write about a disaster on the Mediterranean Sea in the article "Boat Packed With Migrants Sinks Near Sicily, Killing Dozens." WHERE did a boat full of migrants sink? WHY did it sink? WHEN did the accident happen? HOW many people were reported dead? HOW many are still missing? WHY are some people critical of European immigration policy? WHERE had the boat traveled from? WHO were most of the passengers on the boat? WHY did so many victims drown? HOW many people have died on the Mediterranean Sea in the past 20 years, according to the International Organization for Migration? WHAT do you think Europe should do about the operational and humanitarian challenge presented by the flow of migrants across the Mediterranean Sea? HOW can European and African nations work together to try to prevent a similar event from happening again?