Organisation that operates advanced networks for research and education, including GÉANT

Acronym doesn’t need spelling out for the CERN Courier

Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (Department of Astrophysics, Particle Physics, Nuclear Physics and Associated Instrumentation​), CEA

Acronym doesn’t need spelling out for the CERN Courier

lower case

Two words. Initial capital letters if talking about the CERN Data Centre.

Not dataset or data-set.

Dates should be written Saturday, 24 April 2010 (not 24^th).

Use the following construction for spans of time:

Willibald Karl Jentschke was the Council delegate for the Federal Republic of Germany from 1964 to 1967.

Though this often reads better if reworded:

From 1964 to 1967, Willibald Karl Jentschke was the Council delegate for the Federal Republic of Germany. 

Double Annular Φ Factory for Nice Experiments, an electron–positron collider at the Laboratori Nazionali di Frascati (LNF)

Acronym doesn’t need spelling out for the CERN Courier

Delivered Duty Unpaid

no italics

Use digits:

the 1950s, 1960s, etc.

the roaring 20s

a man in his 60s

Note that no apostrophe is needed before the "s"

Decimals and percentages use the number, not the word: 2% and 50% and 2.6 kilometres.

With a "c", unless in the official name of a body that uses US spellings, e.g. US Department of Defense

not Delegation, Delegate

Note that the word “delegate” should only ever be used to describe the two delegates to the Council appointed by each Member State.

NOT Head of Department or Department Leader

warehouse

All caps for ATLAS, ALICE, CMS, TOTEM. But LHCb, LHCf.

to invent

but dialog in a computing context