[mschild]

Both English and French are the official working languages of Cern.

They should include more languages than just English, but French is not by default the more obvious choice.

[bowsamic]

Right, but there are other reasons why French is more obvious, not just "by default" but based on arguments and reasoning. Or has HN truly forgotten about these things?

[solveit]

The previous poster was actually inviting you to expound on the other reasons.