Input: Read this: It has been possible to teach a migration route to a flock of birds, for example in re-introduction schemes. After a trial with Canada geese Branta canadensis, microlight aircraft were used in the US to teach safe migration routes to reintroduced whooping cranes Grus americana.
Question: Which birds did they reintroduce to the US?

Output: whooping cranes


Input: Read this: It also includes the alternative 1440×1152 HDMAC scan format. (According to some reports, a mooted 750-line (720p) format (720 progressively scanned lines) was viewed by some at the ITU as an enhanced television format rather than a true HDTV format, and so was not included, although 1920×1080i and 1280×720p systems for a range of frame and field rates were defined by several US SMPTE standards.)
Question: What was viewed by some as enhanced television format and not true SDTV format?

Output: unanswerable


Input: Read this: United States v. LaMacchia 871 F.Supp. 535 (1994) was a case decided by the United States District Court for the District of Massachusetts which ruled that, under the copyright and cybercrime laws effective at the time, committing copyright infringement for non-commercial motives could not be prosecuted under criminal copyright law. The ruling gave rise to what became known as the "LaMacchia Loophole," wherein criminal charges of fraud or copyright infringement would be dismissed under current legal standards, so long as there was no profit motive involved.
Question: If there is no profit involved, what would happen to criminal charges of fraud?

Output: dismissed


Input: Read this: Human interference has nearly exterminated the trees in many areas, and, except for the beech forests of the Austrian Alps, forests of deciduous trees are rarely found after the extreme deforestation between the 17th and 19th centuries. The vegetation has changed since the second half of the 20th century, as the high alpine meadows cease to be harvested for hay or used for grazing which eventually might result in a regrowth of forest. In some areas the modern practice of building ski runs by mechanical means has destroyed the underlying tundra from which the plant life cannot recover during the non-skiing months, whereas areas that still practice a natural piste type of ski slope building preserve the fragile underlayers.
Question: What has changed since the second half of the 20th century?

Output:
The vegetation