The government has responded by imposing curfews and by deploying troops in the regions. On 10 June 2012, a state of emergency was declared in Rakhine, allowing the military to participate in administration of the region. The Burmese army and police have been accused of targeting Rohingya Muslims through mass arrests and arbitrary violence. A number of monks' organisations that played a vital role in Myanmar's struggle for democracy have taken measures to block any humanitarian assistance to the Rohingya community.
How have the friar organizations contributed to the struggle in Burma?
monks' organisations that played a vital role in Myanmar's struggle for democracy have taken measures to block any humanitarian assistance to the Rohingya

The astronomer Aristarchus of Samos was the first known person to propose a heliocentric model of the solar system, while the geographer Eratosthenes accurately calculated the circumference of the Earth. Hipparchus (c. 190 – c. 120 BC) produced the first systematic star catalog. The level of achievement in Hellenistic astronomy and engineering is impressively shown by the Antikythera mechanism (150-100 BC), an analog computer for calculating the position of planets. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe.
Who created the sun-centered model of the solar system?
Aristarchus of Samos

One wave of the population boom ended abruptly in the mid-1980s, as oil prices fell precipitously. The space industry also suffered in 1986 after the Space Shuttle Challenger disintegrated shortly after launch. There was a cutback in some activities for a period. In the late 1980s, the city's economy suffered from the nationwide recession. After the early 1990s recession, Houston made efforts to diversify its economy by focusing on aerospace and health care/biotechnology, and reduced its dependence on the petroleum industry. Since the increase of oil prices in the 2000s, the petroleum industry has again increased its share of the local economy.
The petroleum industry has become a larger part of Houston's economy again for what reason?
the increase of oil prices in the 2000s