question:
Hydrogen is an authorized food additive (E 949) that allows food package leak testing among other anti-oxidizing properties.
How is hydrogen used as a food additive?

answer: yes

question:
After the Battle of the River Plate with the Royal Navy and Royal New Zealand Navy on 13 December 1939, the Graf Spee retreated to Montevideo's port, which was considered neutral at the time.
Who was the Admiral of the German pocket ship?

answer: no

question:
In the 20th century, Russian was mandatorily taught in the schools of the members of the old Warsaw Pact and in other countries that used to be satellites of the USSR.
Where was Russian schooling mandatory in the 20th century?

answer: no

question:
A common declaration and a joint Creed issued after the visit demonstrated that there are virtually no more[additional citation needed] theological discrepancies between the Coptic and Roman Catholic Churches.
How many times did Coptic Patriarch Shenouda III meet with Paul VI in 1973?

answer:
no