IN: The PlayStation 2 was designed to be backward compatible with PlayStation games. However, not all PlayStation games work on the PlayStation 2. In addition, later models of the PlayStation 2 console could not play all of the games that were released for prior version of the PlayStation 2. This article provides a list of some of the PlayStation and PlayStation 2 games that are not compatible with all models of the PlayStation 2.
can you play all ps1 games on ps2?

OUT: no

IN: The flag of the United States is sometimes burned in protest of the policies of the American government, both within the country and abroad. The United States Supreme Court in Texas v. Johnson, 491 U.S. 397 (1989), and reaffirmed in U.S. v. Eichman, 496 U.S. 310 (1990), has ruled that due to the First Amendment to the United States Constitution, it is unconstitutional for a government (whether federal, state, or municipal) to prohibit the desecration of a flag, due to its status as ''symbolic speech.'' However, content-neutral restrictions may still be imposed to regulate the time, place, and manner of such expression. If the flag that was burned was someone else's property (as it was in the Johnson case, since Johnson had stolen the flag from a Texas bank's flagpole), the offender could be charged with petty larceny (a flag usually sells at retail for less than USD 20), or with destruction of private property, or possibly both.
is it illegal to desecrate the us flag?

OUT: no

IN: Further work on the system showed that the orbits proposed for the candidate planets were catastrophically unstable on timescales far shorter than the age of the system. Indeed, the authors found that the system was so unstable that it simply cannot exist, with mean lifetimes of less than a thousand years across the whole range of plausible orbital solutions. Like other planetary systems proposed around similar evolved binary star systems, it seems likely that some mechanism other than claimed planets is responsible for the observed behaviour of the binary stars - and that the claimed planets simply do not exist.
planetary orbits around stars in binary systems are always unstable?

OUT: yes

IN: Costa Rica (/kst rik/ ( listen); Spanish: (kosta rika); literally meaning ''Rich Coast''), officially the Republic of Costa Rica (Spanish: Republica de Costa Rica), is a country in Central America, bordered by Nicaragua to the north, Panama to the southeast, the Pacific Ocean to the west, the Caribbean Sea to the east, and Ecuador to the south of Cocos Island. It has a population of around 4.9 million, in a land area of 51,060 square kilometers (19,714 square miles); over 300,000 live in the capital and largest city, San Jose with a population of an estimated 333,980 in 2015.
is costa rica a territory of the united states?

OUT:
no