Problem: The initial near-complete MPEG-1 standard (parts 1, 2 and 3) was publicly available on 6 December 1991 as ISO CD 11172. In most countries, patents cannot be filed after prior art has been made public, and patents expire 20 years after the initial filing date, which can be up to 12 months later for filings in other countries. As a result, patents required to implement MP3 expired in most countries by December 2012, 21 years after the publication of ISO CD 11172.
How long can it take for patents to be approved after initially being filed?
The answer is the following: 12 months

Problem: As the number and size of agricultural societies increased, they expanded into lands traditionally used by hunter-gatherers. This process of agriculture-driven expansion led to the development of the first forms of government in agricultural centers, such as the Fertile Crescent, Ancient India, Ancient China, Olmec, Sub-Saharan Africa and Norte Chico.
What were the Fertile Crescent and Ancient India ?
The answer is the following: agricultural centers

Problem: The island covers an area of 25 square kilometres (2,500 ha). The eastern side is wetter than the western. Although the climate is essentially arid, the rainfall does average 1000 mm annually, but with considerable variation over the terrain. Summer is from May to November, which is also the rainy season. Winter from December to April is the dry season. Sunshine is very prominent for nearly the entire year and even during the rainy season. Humidity, however, is not very high due to the winds. The average temperature is around 25 C with day temperatures rising to 32 C. The average high and low temperatures in January are 28 C and 22 C, respectively, while in July they are 30 C and 24 C. The lowest night temperature recorded is 13 C. The Caribbean sea waters in the vicinity generally maintain a temperature of about 27 C.
How much average rainfall does St. Barts get per year?
The answer is the following: 1000 mm

Problem: General Ridgway was appointed Supreme Commander, Korea; he regrouped the UN forces for successful counterattacks, while General James Van Fleet assumed command of the U.S. Eighth Army. Further attacks slowly depleted the PVA and KPA forces; Operations Courageous (2328 March 1951) and Tomahawk (23 March 1951) were a joint ground and airborne infilltration meant to trap Chinese forces between Kaesong and Seoul. UN forces advanced to "Line Kansas", north of the 38th parallel. The 187th Airborne Regimental Combat Team's ("Rakkasans") second of two combat jumps was on Easter Sunday, 1951, at Munsan-ni, South Korea, codenamed Operation Tomahawk. The mission was to get behind Chinese forces and block their movement north. The 60th Indian Parachute Field Ambulance provided the medical cover for the operations, dropping an ADS and a surgical team and treating over 400 battle casualties apart from the civilian casualties that formed the core of their objective as the unit was on a humanitarian mission.
Under the guidance of Generals Van Fleet and Ridgway, joint forces were able to achieve what goal?
The answer is the following:
depleted the PVA and KPA forces