Mark McClusky says for elite athletes today, pushing boundaries and breaking records is all about "the aggregation of marginal gains."
Egypt’s new government has relaxed restrictions at its border with the Gaza Strip, allowing many Palestinians to cross freely for the first time in four years. But the move is rattling the Israeli government, which is accustomed to former Egyptian President Hosni Mubarak’s cooperation – more or less – to keep Gaza sealed up.
Now Israel says militants can flow out and weapons can flood in through the Rafah crossing. The BBC’s Kevin Connolly reports on Israel’s reaction to the Arab spring in Egypt and beyond.