Primaries were held in several US states this week. What a primary actually decides, why some go to runoffs, and why reading national trends into one state’s result is usually a mistake.
The Bald Range fire has emptied the village of Summerland and forced 20,000 people from their homes in British Columbia. Why valley towns are so hard to evacuate.
Rescuers are still finding survivors in Colombia three days on, while official and civilian counts of the missing differ by thousands. What is known, and why the numbers disagree.
Why do buildings fall down in earthquakes? What seismic design costs, why economists say the market underprices it, and the argument over codes and enforcement.
Magnitude 7.4 at 103km deep. What magnitude actually measures, why depth changes everything, and the number that predicts damage far better than either.
The earthquake’s epicentre was in Chocó — Colombia’s poorest region, reachable mostly by boat or plane. Why the toll from the worst-hit places always arrives last.
A magnitude 7.4 earthquake in western Colombia has killed at least 224 people and injured more than 1,200. Why it was felt across three countries, and why the toll keeps changing.
A sightseeing flight has crashed near Peru’s Nazca Lines, killing 13. Why those flights exist, and why early explanations after an air crash are usually wrong.
A judge has ruled that abuse victims in Vermont can sue individual parishes as well as the diocese. Why diocesan bankruptcies happen, and the question of who owns church property.
Cuba’s national grid partially collapsed after transmission lines failed between Matanzas and Pinar del Río. Why one broken link can darken a region in seconds.