Problem: Reservations are essentially caveats to a state's acceptance of a treaty. Reservations are unilateral statements purporting to exclude or to modify the legal obligation and its effects on the reserving state. These must be included at the time of signing or ratification, i.e. "a party cannot add a reservation after it has already joined a treaty".
When must reservations be included in a treaty?
The answer is the following: at the time of signing or ratification

Problem: In 1939, coinciding with the start of World War II, Rene Dubos reported the discovery of the first naturally derived antibiotic, tyrothricin, a compound of 20% gramicidin and 80% tyrocidine, from B. brevis. It was one of the first commercially manufactured antibiotics universally and was very effective in treating wounds and ulcers during World War II. Gramicidin, however, could not be used systemically because of toxicity. Tyrocidine also proved too toxic for systemic usage. Research results obtained during that period were not shared between the Axis and the Allied powers during the war.
Who discovered tyrothricin?
The answer is the following: Rene Dubos

Problem: During Victoria's first pregnancy in 1840, in the first few months of the marriage, 18-year-old Edward Oxford attempted to assassinate her while she was riding in a carriage with Prince Albert on her way to visit her mother. Oxford fired twice, but either both bullets missed or, as he later claimed, the guns had no shot. He was tried for high treason and found guilty, but was acquitted on the grounds of insanity. In the immediate aftermath of the attack, Victoria's popularity soared, mitigating residual discontent over the Hastings affair and the bedchamber crisis. Her daughter, also named Victoria, was born on 21 November 1840. The Queen hated being pregnant, viewed breast-feeding with disgust, and thought newborn babies were ugly. Nevertheless, over the following seventeen years, she and Albert had a further eight children: Albert Edward, Prince of Wales (b. 1841), Alice (b. 1843), Alfred (b. 1844), Helena (b. 1846), Louise (b. 1848), Arthur (b. 1850), Leopold (b. 1853) and Beatrice (b. 1857).
Queen Victoria and Prince Albert had how many more children after Victoria's birth? 
The answer is the following: eight

Problem: The most-viewed network in France, TF1, is in nearby Boulogne-Billancourt; France 2, France 3, Canal+, France 5, M6 (Neuilly-sur-Seine), Arte, D8, W9, NT1, NRJ 12, La Chaîne parlementaire, France 4, BFM TV, and Gulli are other stations located in and around the capital. Radio France, France's public radio broadcaster, and its various channels, is headquartered in Paris' 16th arrondissement. Radio France Internationale, another public broadcaster is also based in the city. Paris also holds the headquarters of the La Poste, France's national postal carrier.
What is the name of France's national postal carrier?
The answer is the following:
La Poste