Mark McClusky says for elite athletes today, pushing boundaries and breaking records is all about "the aggregation of marginal gains."
The president of Brazil held an emergency cabinet meeting today to deal with a wave of protests across the country in the last week.
Yesterday more than a million people took part in demonstrations in nearly 100 cities.
The protests started over an increase in transit fares but are now aimed at corruption.
Meanwhile, protests also continue in Turkey.
The BBC’s Katya Adler reports from Istanbul.